>> inside jail, mason is an advocate for healthy living. >> my friends call me popeye because i work out a lot. and i'm pretty cut up for being 56 years old. pretty, as they say, ripped. >> what are you doing, popeye? >> we are setting some chairs up to do dips. since we don't have a dip bar, we have to make do with this. so these chairs work pretty good. we get the right level we want. and just make do with what we have. it's probably one of the best exercises to do. if you can just do one exercise, dips are probably the best thing you could do. i try to stay in shape all the time. i surf a little bit. these guys come in here, the youngsters, they ask me for advice on how to work out. >> that's a good dip. you're going all the way down, coming up. see it working his chest, his shoulders, his lats. most of them, if you look around, you can see, they're not in that good of shape. seems like they've been sitting on their butts too long, watching video games and working on computers. they have to get busy working out. because they're actually in pretty sad shape for their ages.