Do a shot of espresso before a workout. (This may explain Stone's trademark high energy.) Caffeine can raise your basal metabolic rate, aka how quickly you torch calories.

Talk Smack When your inner skeptic says you can't do something (like maybe the last 2 reps of the burpee bonus), steal her reply: "Watch me!"

Have a Crutch Hers: the iPod Nano. An upbeat, I'm-in-charge song (Icona Pop's "I Love It" is currently on repeat) can carry you through even a hellish session.