Counter Movement Jump
The Counter Movement Jump is a jump form used in sports science for jump diagnostics to test the concentric strength of the jump muscles , a backward movement (downward) is allowed.
Usually the jump is performed from the basic position, the arms are placed on the hips and should not be involved in the swinging movement. The goal is to jump as high as possible. The backward movement and the pre-tensioning of the jump muscles created in this way already generates a positive force at the lower turning point of the movement, which is greater than the force generated by one's own body weight ( principle of initial force ). Influencing variables on the flight altitude are the recovery speed and bending depth, but optimal values of these two parameters are individually different.
At least the flight altitude is measured as a performance index during this jump, usually with the help of force plates .