Calisthenics refer to exercises using simple movements that is usually performed without weights or other equipment for the purpose of muscular development.
Repeated motions of calisthenics done over an extended period of time builds muscle endurance, strength and flexibility.
Moreover, calisthenics which is also known as dynamic stretching is a type of training in which only body weight is used. Push-ups and Chin-ups are examples of calisthenics.
Research has shown that calisthenics is a better warm up than stretching, as it recruits more muscle fibres.