Explain how calisthenics can include both isometric and isotonic exercises.

Answer:

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. Push-ups and sit-ups are isotonic calisthenics that involve muscle movement, while isometric exercises such as yoga require great effort to hold the body motionless in different positions.