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ExerciseHumans have espoused the value of exercise for centuries, from ancient Greek gymnasiums and Roman military drills to the advice of Susruta of India, a physician who prescribed daily exercise to prevent and treat diseases around 600 BCE.
Today, modern science confirms what our predecessors long assumed: movement is a biological necessity for physical and mental well-being. Without it, nearly every organ and biological process in the body—muscle, heart, brain, metabolism—begins to decline.
Physical activity sets off a cascade of internal changes that begins with muscle contractions. This triggers the production of proteins called myokines, chemical messengers that are released into the bloodstream and travel to distant organs to reduce inflammation, improve insulin sensitivity, and promote brain development. Perhaps most remarkably, exercise doesn't just change how the body functions—it changes how genes express themselves. Through a process known as epigenetics, physical activity turns beneficial genes "on" and harmful genes "off" without altering the physical structure of DNA.Explore Exercise
What we've found
The exercise sweet spot is shorter than you'd think—and longer workouts aren't generally betterA meta-analysis concluded that resistance training for about 60 minutes per week provided the best health benefit—decreasing the likelihood of death for individuals within a specific timeframe around 27%. National Library of MedicineExplore a series of bedtime exercises to improve sleepLow-impact, mindful movements can potentially help the body and mind relax before sleeping. Such exercises could be a helpful complement to regular exercise during the day. AARPThe reason some people love exercise may be because of their microbiomeCertain gut microbes in mice trigger dopamine release and drive motivation to exercise more. Scientists are investigating whether humans carry similar microbial patterns that influence our natural inclination towards movement, exploring how unseen microbial ecosystems may shape mammalian fitness behavior and reinforce innate reward pathways. (Some users may experience a paywall.) National GeographicAstronauts exercise on the International Space StationAstronauts maintain bone, muscle, and cardiovascular health with physical activity. It's crucial astronauts make time to exercise for approximately two hours per day. This resource offers a behind-the-scenes look at how high-intensity workouts help prevent muscle atrophy, bone density loss, and aerobic decline during months-long space missions. NASAHealth officials recommend at least 150 minutes of aerobic exercise per weekThis official guideline from the CDC defines the baseline recommendation for healthy adult activity. These recommendations also emphasize that any movement is better than no movement, and that even short bursts of activity spread throughout the week benefit the mind and body. Centers for Disease Control and PreventionExercise changes your genes without changing your DNAPhysical activity can turn beneficial genes on and harmful genes off, without altering the underlying DNA code. This engaging article explains the epigenetic mechanisms that take place with exercise and ultimately result in improved metabolism, lower inflammation, and optimized brain function. Science Connected MagazineExercise releases chemicals that enhance cognitive functionNeurotransmitters like dopamine, serotonin, and norepinephrine, along with increased brain-derived neurotrophic factor levels, enhance a wide range of brain functions. New research demonstrates a direct link between movement and numerous cognitive benefits, including memory, learning, and stress resilience. Better Than YesterdayExercise helps make your arteries more elasticRegular aerobic exercise releases nitric oxide, a key molecule that relaxes blood vessel walls and improves vascular function. These exercise-induced adaptations make the heart work more efficiently and blood vessels become more elastic, leading to improved circulation and lowered cardiovascular risk. Harvard HealthMyokines are molecules that facilitate some of the benefits of exerciseWhen muscles contract, they release ‘hope molecules’ (myokines) such as IL-6 and irisin. These proteins then travel through the bloodstream to reduce inflammation, improve insulin sensitivity, and even support brain repair. This piece illustrates how movement triggers a systemic healing cascade throughout the human body. NIHExercise improves brain blood flow, stimulates neural growth, and moreExercise has dramatic effects on human biology, including reducing some of the long-term harms associated with chronic stress. Its effects are also pronounced in the brain, including improved memory retention, sleep, cognitive functioning, and more. TED TalksOne minute of exercise correlates to five extra minutes of life (on average)Doctors increasingly view exercise as the single most powerful medical intervention available. Observational studies suggest one minute of exercise correlates to an additional five minutes of life as humans age. Stanford researcher Euan Ashley discusses our current understanding of how exercise provides benefits at the cellular level. The RingerMicrotears in muscles from exercise cause fibers to grow back largerPlacing muscle under increased load or stress causes damage that requires rest to repair, leading to stronger, more enduring muscle over time. Muscles adapt to such increasing demands by improving their efficiency with approaches that include increasing the number of mitochondria housed in hundreds of thousands of muscle cells. Institute of Human AnatomyExercise causes diet-independent changes in the gut microbiomeCardiovascular exercise has been found to boost the gut's population of beneficial bacteria, and exercise overall decreases the likelihood of developing a "leaky gut," a condition in which a porous gut lining allows bacteria to leak into the bloodstream and cause inflammation. MDPIHow the gut microbiome can affect heatstroke riskSome research suggests that our gut microbiome influences our risk of exertional heatstroke. If exercise boosts our body temperatures to unsafe levels, increasing gut permeability, that can cause a "leaky" gut—allowing bacteria and other gut microbes to leak into the bloodstream and potentially trigger endotoxemia, a potentially life-threatening inflammatory response that can occur with heat exhaustion and heatstroke. MysportscienceHow to safely start 'Strengthmaxxing' with body weight—not actual weightsBeginning with exercises like a pull-up, for example, a weight training beginner can start in a "dead hang" with arms straight while grasping the bar and with feet off the ground. Then, lift your eyes to bar height before dropping again without any bouncing. Exercisers should feel like they've reached "failure" before they're done—meaning they feel like they could only do a couple more of the exercise if it was a life-or-death situation. (Some users may encounter a paywall.) The Washington PostWatch this how-to video series on how to start strength trainingMayo Clinic put together a collection of videos demonstrating how to get started with strength training, including with exercises like step-ups, abdominal crunches, and more. The Mayo Clinic advises people to try to engage in these exercises working all the major muscles at least twice a week. It also encourages people to inhale and exhale fully between each repetition—inhaling during the less strenuous part of the exercise. Mayo ClinicResistance training is linked to better memory and cognitive function in older adultsRandomized control trials looking at structural neuroimaging and exercise suggest that resistance training in older adults induces structural brain changes that could reduce the risk of Alzheimer's Disease or mitigate its progression. The benefits have been documented when performed at least twice per week for at least six months. National Library of MedicineA step-by-step guide to the Martha Graham TechniqueThis BBC explainer walks you through Martha Graham's famous approach to dance, offering you six moves you can work into your exercise regiment—or Graham-inspired routine. BBCThe depression paradox refers to a lack of energy to take action to help alleviate itActivities like exercise, even at low levels, have been shown to alleviate some of depression's symptoms for some people. However, depression saps energy levels, making it particularly difficult to motivate oneself to take helpful action. Psychology TodayThe Roosevelt Corollary transformed the Monroe Doctrine from a defensive warning into a rationale for US military interventionIn 1904, President Theodore Roosevelt declared that the US had the right to exercise international police power in Latin America. Over the following two decades, the US intervened militarily in the region about a dozen times—often enough that Marines became known locally as "State Department troops." National ArchivesAnticipatory grief describes experiencing sorrow ahead of a lossAll-consuming anticipatory grief—like if you know a loved one will soon die from a chronic illness—can be disabling. Seeking exercise, healthy food, hobbies, and trying to toggle between thinking about an upcoming loss and focusing on other matters is important for promoting health.
University of Minnesota ExtensionTwo doctrines of local governance determine how much power cities actually haveUnder what is known as "Dillon's Rule," local governments can only exercise powers explicitly granted by the state. Under "home rule," cities have broader self-governing authority—but the balance between the two depends entirely on state law. National League of CitiesReynolds v. United States (1878) established that religious belief is not a defense for a crimeIn the first major Supreme Court case on the free exercise clause, the court ruled that the government cannot regulate religious belief, but it can regulate religious practice if it violates the law. The case arose from a Mormon man convicted of polygamy who argued his faith required it. OyezRead the language in the Constitution that protects religious freedom in the USThe First Amendment's religion clauses include two provisions: the establishment clause and the free exercise clause. These two parts prevent the government from endorsing any specific religion and from interfering with the free practice of religion. Library of CongressHear how the 2 religious clauses in the First Amendment have been tested and evolved over timeThis podcast examines the evolution of the free exercise and establishment clauses, tracing their development from federal restrictions to state and local laws. Discover the believers who challenged the limits of religious freedom throughout American history. The Bill of Rights spent more than a century largely ignored by the courtsWhen ratified in 1791, the Bill of Rights applied only to the federal government, which exercised little direct control over daily life. It played a limited role in early constitutional law until the 20th century, when legal advocates began using it to challenge state and local laws. US CourtsMalcolm X's 'Ballot or the Bullet' speech emphasized the political power of Black votersThe 1964 speech addressed institutionalized racism in the United States and urged Black Americans to exercise their right to vote or be prepared to defend themselves if democracy continued to fail them. It is lauded as one of the most unflinching speeches from the Civil Rights movement. Teaching American HistoryPeloton makes most of its money via monthly subscriptionsPeloton has two core revenue streams: the exercise equipment it sells and the company's monthly subscription that gives users access to its class library. More than half of Peloton's revenue comes from the company's core product, the monthly subscription. Its "Peloton App+" membership tier is $28.99 per month. InvestopediaThe controversial 'Peloton Wife' ad from 2019 cost the company more than $1B in market valueThe 2019 ad of a man gifting his wife a Peloton exercise bike sparked a wave of controversy, with some calling the ad sexist and fatphobic. The ad's backlash decreased the company's market value by $1.6B. There is a template for how to live a better, healthier day, and it includes a digital sunsetScience suggests that early-morning exercise, later-morning peak work or social time, consistent exercise, and a "digital sunset"—starting to turn down the lights in the evening and avoid screens—are important for circadian health. National Library of MedicineWorld records are often broken later in the day—and scientists wonder if muscle clocks explain the differenceFor reasons that are still not entirely clear, on average, people tend to lift more weight and achieve other exercise feats later in the day. Theories to explain this discrepancy include muscle clocks are at peak performance in the afternoon and that there's morning-to-afternoon variation in core body temperature, hormones, and neural activity. NPRSome parents have objected to yoga in schoolsYoga has been introduced in some public schools as a form of exercise and emotional regulation. Some parents, however, have objected to its inclusion, arguing that it promotes the Hindu and Buddhist religions. Note that this resource will be paywalled for some readers. The AtlanticOn the benefits of 'fart walks'Walking has proven benefits for flatulence by kickstarting the process of peristalsis in the bowels and facilitating easier farts and burps. The timely exercise is also correlated with weight loss (as well as potentially reduced opportunities for social embarrassment). Popular ScienceEven brief physical activity can trigger the release of neurotransmitters that provide mental health boostsA couple of minutes of light walking or stretching can increase feelings of energy and reduce fatigue, not just through the release of endorphins. Exercise can also provide self-regulation and improve task engagement and focus in those with certain mental health disorders, like ADHD. Science FridayMuscles fatigue due to the loss of energy like ATP and glycogenAdenosine triphosphate fuels muscle contraction, and with each contraction (like during exercise), the amount of ATP reduces. ATP helps potassium and sodium move across muscle membranes, generating ions and helping to contract the muscle. TED-EdOptimal human functioning requires movementThere is now ample evidence to back the centuries-old hypothesis that exercise is critical to human health. This review article explores the latest discoveries in exercise science, including how exercise is intrinsic to maintaining our organ systems throughout life. FrontiersAncient Greek gymnasium: where philosophy met fitnessIn ancient Greece, gymnasiums were not just places of physical training, but centers of intellectual life. This article explores the ways in which exercise, philosophy, and education were deeply intertwined, reflecting a cultural belief that physical fitness was essential for mental development. World History EncyclopediaOver time, the World Cup became a commercial powerhouseThe 1954 World Cup featured the first live black-and-white televised broadcast of the event, and in 1970 FIFA introduced color broadcasts in prime-time. Increasing revenues pushed private networks to aggressively bid for broadcast rights. Today the event is a commercial powerhouse, with the 2026 World Cup projected to generate around $4B in TV rights revenue. Bleacher ReportPIckleball's popularity with seniors is partially due to its health benefitsPickleball has always been a game for all ages, but it has been particularly popular among seniors, in part because of its many health benefits, including enhancing hand-eye coordination and burning more calories than walking. TIMEA 1983 NATO war simulation provoked the Soviets to prepare for warThe "SNAFU" podcast, hosted by actor and comedian Ed Helms, explores some of the biggest blunders in history. Season one focuses on the 1983 NATO Able Archer military exercise, a war game that simulated nuclear attacks on the Soviet Union. The USSR mistook the exercise for a genuine threat and prepared its forces for war. Helms recounts this almost catastrophic event in world history with his signature humor. SNAFU with Ed HelmsA 15th-century university student documented a surprisingly detailed fitness planModern fitness stems from the revolution in the knowledge we have of the human body, its cardiovascular systems, how muscles work, and more. Nonetheless, people through the centuries have had fitness regimes—including one university student whose fitness plan was preserved in an obscure document found between a manuscript. Medievalists.netSelf-care can't fix burnout on its ownSteps such as exercise, breathing, mindful eating, and spending time with friends, can help alleviate the fight-or-flight mode response of the body to alleviate stress, but they don't fix the stressors causing the burnout. To address those, workplaces may need to consider how to better manage workloads and duties. Scientific AmericanSome claim breathwork can improve mental health, help process trauma, and moreResearch shows people who practice breathing exercises see a decrease in depression and stress levels, and that such exercises are about as effective at treating PTSD as conventional approaches. Even something as simple as extending exhales can slow one's heart rate and activate the parasympathetic nervous system. Science VSDave Asprey is considered one of the fathers of modern biohackingEntrepreneur Dave Asprey wants to live longer than anyone else, a desire that's led him to biohacking. Asprey relies on supplements, stem cell treatments, rigid dieting, exercise, and more. The inventor of Bulletproof Coffee has no medical or nutritional training, though that's not unusual among biohacking's DIY experimenters. Men's HealthVO2 max measures the body's ability to use oxygen to produce energyVO2 max is the maximum rate at which the body can use oxygen to aerobically produce energy—adenosine triphosphate—for use during intense exercise. Aerobic exercise increases VO2 max, counteracting age-related decline by increasing the body's capillary count and remodeling the heart's left ventricle, increasing the amount of blood it pumps. The Running ChannelModern bodybuilding evolved in the 19th centuryThe origins of modern progressive resistance exercise are traced to ancient Greece, where a repeat Olympic victor carried a calf every day until it grew into a full-sized ox. This 56-minute comedy and history podcast journeys through the rise of modern bodybuilding, which took off during the 19th century. BBCCan humans delay or reverse old age?We're not sure yet. Researchers at the University of California San Francisco are studying why some conditions and behaviors, such as low-oxygen environments and exercise, benefit the aging process, hoping to reveal potential health applications. Some of this research focuses on klotho, a naturally occurring age-regulating hormone named after the Greek Fate Clotho. Animal studies on klotho brain injections found subjects had improved memory recall and age-related degeneration resistance. University of CaliforniaHow to think yourself into healthCan the right thoughts lead to a stronger immune system? Neuroimmunologists like Hai Qi study how drugs targeting the brain, as well as thought exercises, can prompt stronger immune responses to infection. This six-minute video investigates the radical claims. YouTubeInside entrepreneur Bryan Johnson's race to live foreverCreated by entrepreneur Bryan Johnson in 2022, the Rejuvenation Olympics asks participants to find ways, including exercise and dietary supplements, to slow their biological aging. But some of these tactics are extreme in cost or nature—such as Johnson's regular injections of blood from his teenage son. VoxMicrogravity environments reduce muscle mass and bone densityMuscles that assist with balance and resistance to gravity are not subjected to their usual workload on the International Space Station. See the type of exercises that astronauts must complete for roughly two hours daily and learn why these movements are necessary to preserve astronauts' muscles, bones, and cardiovascular health. The Verge
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