The idea that exercise could help depressed patients isn't a new one. But what could be a new idea is that it could also help their hearts.

Cardiovascular exercise like running or walking has a number of health benefits. But too much exercise may be unhealthy, especially after a heart attack.

Fitness is important to many people, but new research hints that it might be an issue of life or death to some patients with heart disease.

Limbs slowed and weakened by arteries with plaque build-up can benefit from exercise. Sometimes, patients with those problems have no choice but to create their own exercise plans.