An active student injured his knee playing basketball and has been advised by his doctor to avoid impact activities that cause heavy force on his bones. what is the most effective activity he can do to maintain his stamina without further injury?

Hi,

An active student injured his knee playing basketball and has been advised by his doctor to avoid impact activities that cause heavy force on his bones. What is the most effective activity he can do to maintain his stamina without further injury?
-swimming, biking

What subject do you need with?

Answer therapeutic community;