“Fat Burn Challenge” is a 32 min. mostly athletic cardio (jacks, punches, fast feet) & bodyweight resistance (lunges, squats, burpees) workout led by Chalene Johnson, and from the Chalean Extreme series. This workout is included on the deluxe DVD, with “Get Lean Intervals” and “I’ve Got Abs” workouts. This workout follows a similar format to the basic set “Burn it Off” workout (exercises, short duration of time, focus on intensity in all exercises), and is used as a substitute cardio workout in the Chalean Extreme 90- day rotation (if desired). The workout is sequenced w/ a warm-up, 3 sets of exercises followed by a 30 second rest, twice (but w/ different exercises for second sequence), then 6 more exercise followed by a cool-down. Most of the exercises are time-based (complete exercises in set time), and there are two exercises cued w/ a rep range. Users are supposed to push themselves the entire time (just take the 30 second rests when cued). The workout is sequenced nicely, moves quickly, and the rests feel like they are cued right, when one needs it (and not too long or short). Many of the exercises are low impact (but some are not), and the burpee is modified w/ plie/sumo stance which is supposed to be easier on the knees than the traditional (I really like that variation). Chalene’s cuing & form pointers are good.