Нові реалії сучасної України та світу. 3.1. Physical fitness systems using isotonic exercise

Isotonic exercises are exercises in which a constant tension is maintained
in the muscles. Isotonic exercises involve the tension of several muscle groups
while changing their length. In such a muscle contraction, two phases are
distinguished: concentric - with shortening of the muscle and eccentric – with its
lengthening (for example, from the position «arms to the sides» take them as far
back as possible and hold them in this position, performing springing
movements). Isometric and isotonic exercises are performed at a slow pace,
smoothly, but with constant maintenance of tension in the muscles until slight
pain or inability to maintain tension further. These exercises have become the
basis of isotonics, callanetics, and pilates