When a frog is in a sitting position its leg muscles are . This stretches the leg tendons. Tendons are elastic like rubber bands. Stretching them stores within them. Then when it jumps the tendons release the energy propelling them into the air.

Contracted and Energy

Explanation:

When a frog is in a sitting position then its muscles are contracted. This contraction of muscles leads to the storage of some sort of energy, that allows the stretching of the leg tendons. This stored energy gets released when the frog jumps from one place to another. These tendons present in the frog legs act like a rubber band which has elastic energy and this energy is released when the frog jumps and propels the frog in the air.

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