Workout Update: 25 Minute Speed Train: Day 41

Day 41 was core cardio, so the entire workout was done on the floor, alternating between plank-based exercises, such as mountain climbers, and prone exercises, like dumbbell crunches. The format is the same as the prior weeks. You do four blocks of work, with each block consisting of two exercises that you do back-to-back for 45 seconds, twice. Then you have a burnout block in which you do four of the exercises from blocks 1-4, each for 45 seconds back-to-back with no rest between them. So, again, this is not a traditional cardio workout from programs like P90X, Insanity, or even Lift 4, but it does get your heart rate up, and every exercise works your core.