Cummings, a NASM-certified personal trainer, is here with a HIIT workout that features six different moves you will be repeating as many times as you can within 10 minutes. You'll be doing 10 reps of the following: plank jacks, plank knee to elbows, inchworms, lunge pops (aka, lunge jumps), high knees with knee taps, and drop squats with heel taps.