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Just the mental approach to training. >> reporter: but ricky and stanley say if they can do it, so can you. >> get off your couch. get off the fast-food diet. >> take a step. no matter how hard the step is. for me it was just get moving. find the will to move. >> reporter: and don't stop. but it can't have... can't have about half a i assure you it does. i can only taste... only taste the crunchy clusters, honey, and brown sugar. no madam, i don't have esp. (announcer) fiber one. cardboard no. delicious yes. [ female announcer ] last year, the u.s. alone used over 39 billion plastic bo@eles of...

>> reporter: back in san diego, he hits the gym four or five days a week, spin workouts and weightlifting to build muscle. every friday, you'll find him hiking up this mountain with the teens in his program. >> everyone that i invite to come to this mountain ends upcoming to this mountain regularly. >> reporter: for both men, adjusting to their new fit lifestyles hasn't always been easy. >> i'm not going to lie. i have had fries here and there. >> reporter: even when they're not working out. >> my biggest obstacle for sure is between my ears. just the mental approach to training. >> reporter: ...