put your dominant arm out in front of you.
put your hand in a fist.
then move your wrist up and down.
you will see the muscle in your arm go up and down.
girls already have it but boys can develop a bigger jo muscle.
put your hand in a fist.
then move your wrist up and down.
you will see the muscle in your arm go up and down.
girls already have it but boys can develop a bigger jo muscle.
by mrs. phelps<3 October 9, 2008