my abdomen is relatively hard...alot harder than my friends anyway

My height is 163cm...no idea what that converts into

My age is 17years 7 months...

I have been doing a bit of swimming as well when i can its just slightly inconvenient at the moment with college and work taking up...well all my time! Its the holidays soon though so hopefully i will be able go more often and get into a routine which i will hopefully be able to stick to once college starts again...