Regular, consistent exercise boosts your immune system.

Studies have shown that regular exercise - even just walking - can make you happier, build your stamina, and boost your self-esteem.

But "exercise can boost your mood, and you need that lift even more during the winter,"says Patricia Laguna, PhD, a professor of kinesiology at California State University, Fullerton.

Frequent and regular physical exercise boosts the immune system, and helps prevent the "diseases of affluence" such as heart disease, cardiovascular disease, Type 2 diabetes and obesity.

A subsequent study found that a short writing exercise in which college students, who were enrolled in an introductory physics course, wrote about their most important values substantially decreased the gender performance gap and boosted women's grades.

Physical exercise boosts the brain's rate of neurogenesis throughout life, while mental exercise increases the rate at which those new brain cells survive and make functional connections into existing neural networks.

Slideshow: Fibromyalgia Exercises That Help Increase Energy Try these fibro-friendly exercises to boost your energy and decrease pain and stiffness.

Research shows that regular aerobic exercise boosts mood and relieves stress.

Increasing exercise can boost your energy and control your blood sugar.

Regular exercise helps reverse joint stiffness, builds muscle, and boosts overall fitness.