This compound move recruits several large muscle groups at once to maximize your calorie burn and condition your core.
How to do it: Grab a pair of dumbbells and get into full plank position with your hands on top of the weights. Bend your right knee and cross your right leg over your left as you lower into a pushup. Press back up to plank, and immediately rotate your body to the left, picking up the dumbbell in your left hand as you open your chest and reach your left arm up to ceiling. Hold for 1 count. Slowly lower the weight back to center plank. Repeat the movement with your left leg crossing over, opening to right side. Continue alternating sides each for 1 minute, doing as many reps as you can with good form.
Form tip: Keep your abs braced in tight the entire time to control your movements. If it's too tough to balance on top of the weights, place your hands on the floor and pick up the weight as you rotate. Still too challenging? Practice the move using just your bodyweight and add in the dumbbells when you feel ready.