A study published in October 2017 in the American Journal of Psychiatry suggested that even just one hour of exercise of any intensity each week can help prevent depression. The study monitored levels of exercise and symptoms of depression and anxiety in 33,908 adults over 11 years and found that even small amounts of physical activity had a protective effect against depression, regardless of the person’s age or gender.
In addition to recommending exercise for general health and well-being, doctors may prescribe specific exercise plans in some situations. Before elective surgery, doctors may recommend people participate in exercise routines to enhance their recovery from surgery. Doctors also prescribe specific exercise programs to rehabilitate people after serious injuries or disorders such as heart attacks, strokes, major surgery, or injury (see Overview of Rehabilitation).
Sweating it out in the gym is a known de-stressor. Harvard Medical School has shown that aerobic exercise helps curb stress hormones like cortisol and adrenaline (as long as you're not overdoing it), while also flooding your system with feel-good endorphins. It also ups the calming, good-mood brain chemicals serotonin and dopamine. So while exercise itself is actually putting low-level physical stress on the body, it can be pretty mentally relaxing.
Those buff lab rats might be smarter than we think. Various studies on mice and men have shown that cardiovascular exercise can create new brain cells (aka neurogenesis) and improve overall brain performance Aerobic exercise is the critical variable in an enriched environment that increases hippocampal neurogenesis and water maze learning in male C57BL/6J mice. Mustroph ML, Chen S, Desai SC, Cay EB, DeYoung EK, Rhodes JS. Neuroscience Program, The Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA. Neuroscience. 2012 September 6;219:62-71. Aerobic exercise improves hippocampal function and increases BDNF in the serum of young adult males. Griffin EW, Mullally S, Foley C, Warmington SA, O’Mara SM, Kelly AM. Department of Physiology, School of Medicine, University of Dublin, Trinity College, Dublin, Ireland. Physiology & Behavior. 2011 October 24;104(5):934-41.. Ready to apply for a Nobel Prize? Studies suggest that a tough workout increases levels of a brain-derived protein (known as BDNF) in the body, believed to help with decision making, higher thinking, and learning. Smarty (spandex) pants, indeed.
“Inactivity is associated with increased risk for a number of cancers, including colon and breast cancer,” McCleary says. “Exercise has been linked with a decreased risk of developing cancer, death from cancer, and recurrence of certain cancers.” The suggested mechanisms at play include exercise’s beneficial effects on the immune and surveillance systems that detect and kill cancer cells, improved cardio-respiratory status, improved hormonal profiles, weight maintenance, and other beneficial metabolic effects, he says.
The best part about exercising is how much you enjoy the downtime. If you think laying on your couch all day is enjoyable, it has nothing on that hour you spend as a couch potato after a rigorous workout. Jay-Z said it best, “in order to experience joy, you need pain.” The harder you push yourself while exercising, the better you’ll feel when you’re relaxing.

Exercise provides socialization opportunities. Exercising outside the home, whether in the great outdoors, at a gym or recreation center, in an exercise class, sport group, walking or running club, etc., all lead to encounters with other people who also enjoy working out. New acquaintances and friendships develop readily in such contexts. Over time, having the pleasure of one's exercise group's company becomes another reason to exercise.

It is very difficult to engage in exercise when other health concerns are at play. If exercise is very difficult with your present state, focus on eating right. Most weight loss specialists agree that weight loss has more to do with diet (up to 95% diet) versus exercise. Take a look at this article for advice: http://www.wikihow.com/Develop-Healthy-Eating-Habits


Endorphins, amiright? The link between exercise and happiness has been well-studied, and the results are very positive (just like you’ll be after some gym time). One study from the University of Vermont found that just 20 minutes of exercise can boost your mood for 12 hours. Cardio and strength training can both give you a lift, and 30-60 minutes of exercise three to five days a week is optimal for mood benefits, according to the U.S. Office of Disease Prevention and Health Promotion.
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