Get into plank position, hands on the ground directly under your shoulders, legs about hip width apart (a). Keeping your elbows tucked against your sides and your body in a straight line, bend your elbows and lower your entire body until it almost touches the ground (or as far down as you can) (b). Return to start position (c). Repeat.
20 Split Jumps (Jumping Lunges)
Start with feet hip width apart, arms at your sides. Perform a small jump upwards while simultaneously moving your right leg forward and left leg backwards, landing in a lunge with right knee bent directly over your toes, left knee bent directly in line with your hip (a). Jump and at the same time reverse legs (b). Repeat.