A change in body position during sporting activities can change the position of the centre of mass

The centre of mass remains within the body throughout the movement in sporting activities such as walking, Javelin, Discus, golfing, etc

The centre of mass temporarily lies outside the body in sporting activities such as the Fosbury Flop High jump

Levers: Is the human body is a machine?

We need to Distinguish between first, second, and third class levers.

Class depends on the position of Pivot/fulcrum, Load and Effort

Normally but not always in sports,

• the pivot is provided by joints;

• Load by the body weight and sporting equipment;

• Effort is provided by muscles

The central component of the three (PLE) determines the class of the lever

Levers

What about the triceps-elbow?

What about the ankle-calf joint?