It might not be the most effective way of working out, but it's a form of physical training all the same. (mindbodygreen.com)
Just as in physical training, you need to rest and recover between work days in order to get stronger. (inc.com)
Whether you are gathering the family for a backyard workout or organizing physical training for a few hundred soldiers, bodyweight exercises will get your group in shape. (gymjunkies.com)