Do you have a body part or muscle group you just can't get to grow? Why are some body parts, like calves or biceps, so hard to develop for some people? Find out why and what you can do to get those slow-to-develop parts to grow.
4 Ways Exercise Improves Aging. Exercise not only makes you look and feel better now - it makes it more likely you'll be healthy enough to enjoy your retirement years. Staying physically active can help you age smarter. Here are four ways exercise improves the aging process.