The singer also checked a follower on Instagram who insinuated she has "lipo abs."

At 41, Katie Holmes sports a fit physique that could still keep up with her 13-year-old daughter.

The founder of Nick Jonas' gym speaks on what the physically fit singer does to keep healthy and fit.

Let's talk about adult weight-loss camps. Yes, you read that correctly. When you hear the words "fat camp" you think of children getting sent away for the summer to improve their health and shed some extra pounds. Guess what? You don't have to be a kid to attend-adult weight-loss camps do exist.