Plank with Side Rotation

1. Assume classic plank position, balancing on your toes and forearms. Keep your back straight and neck loose.
2. Rotate, shifting your weight to your left forearm as you extend your right arm straight up towards the ceiling.
3. Return to classic plank, keeping your hips in line with your shoulders and lower abdominal area tight.
4. Complete one set of 15 on your left side, then switch to your right for another set of 15.