Why do I so easily get my stomach so toned?
I noticed I had a little flab in my stomach, so at the beginning of this week I decided to do sit-ups and crunches. It’s now the end of the week and my stomach is already really toned, like I’m starting to get abs. Does this mean I’m just really healthy?
P.S. I also noticed during tennis seasons, my weak arms develop muscles really quickly. I really like how my body functions this way, but I’m just wondering why.

Some people’s muscles tone up really easily. You are obviously one of those fortunate people.
Good for you!
no its just means that you are slim
thats a good question, although i wish i had a stomach like yours. its probably because u barely have bodyfat. (pinching the skin) and it looks toned because you are working out your abdominal. u should keep it up tho, not very many people have a stomach as what u are saying. but dont let anything get in the way of it, my friends had a post on there blogs about how to make the core of your stomach appeal much more sppealing
keep it up!