immune system
estrogen
testosterone
yes
There is no evidence that a creatine supplement will strengthen your immune system and reduce your risk of illness.
You can strengthen your muscular system by using it. By lifting weights or running, you are using the muscles, and they are growing and toning. When you don't use your muscles, the are not as strong and you ware weaker as a whole.
it can strengthen the lungs
A plan to organize and strengthen the nation's economy (APEX)
Have kids... it is like nerve exercise, every day
your butt
Help build up your immune system and strengthen it
Exercise and strengthen leg muscles and cardiovascular system.
it never did.