Is it true , that if you dont use it , you';ll lose it?

ummm....Is it true , that if you dont use it , you';ll lose it?
I was very inactive for a while and started to get arthritis in both my shoulders. I got winded going up a flight of stairs. I started working out and the arthritis is totally gone now, and I can run distances without any problems. So in a way yes, if you don't use your body you will lose it.Is it true , that if you dont use it , you';ll lose it?
depends on what, but i think it's usually true
NONONO
Are you talking about the weenis or your whole body?