4 Single-Arm, Single-Leg Plank
Sets: 2 Reps: 6-8 (each side) Tempo: 131 Rest: 60 Seconds
Get into pushup position on the floor, and then bend your elbows so that your weight is resting on your forearms. Raise one arm off the floor while simultaneously raising the opposite leg. Reverse the motion to return to the starting position and then repeat on the opposite arm and leg. That's one rep.