In your muscles, chemical energy is converted into mechanical energy.

In your muscles, chemical energy is converted into mechanical energy.

In your muscles, chemical energy is converted into mechanical energy.

In your muscles, chemical energy is converted into mechanical energy.

The energy is provided by your muscles, and stored in a spring.

The energy is provided by your muscles, and stored in a spring.

The energy is provided by your muscles, and stored in a spring.

The energy is provided by your muscles, and stored in a spring.

It is chemical to kinetic energy.

When you exercise you use your muscles and your muscles contain Glycogen which could be considered your "energy source". during exercise your muscles use glycogen depleting your energy levels making you feel tired.

Your muscles get the "power" they need from the energy stored in food. When you digest food it gives you energy.