Answer:
Their smile! A happy person is a beautiful one!
An individual having a history of migraine headaches would most likely be diagnosed with common disorder of central nervous system. Migraines are severe headaches which could cause the individual a tremendous amount of pain that are caused by disturbing of vision or nausea.
Because some of the weight is in your muscles.
In calisthenics, the resistance is provided by moving the body against the force of gravity. But while body weight is ultimately the force providing the resistance, calisthenics can include exercises with and without muscle movement.