Move 4: High plank with alternated leg raise
1. Start in a high plank position, making sure to keep the shoulders above the wrists, your back straight, core engaged and tummy held in to protect the lower back from arching.
2. Raise your right leg up then back down in your plank with the toes on the floor. Then raise your left leg up and lower, keeping your shoulders aligned and abdominals engaged.
3. Keep alternating legs and repeat 30 times.