Sasha recently discovered an armpit lump
Answer:
I'm pretty sure its Skeletal System
Explanation:
One way in determining your fitness level is trying to do a Full Sprint Run and holding your breath for as long as you can. That way you can determine your cardiovascular capacity and lung capacity. On improving your fitness levels you should do swimming, jogging and of course a balanced diet.
Answer:
shrugs and grip exercises doesn't use core
