Go into a reverse table top position. Your fingers can point towards your body or away from you. Lift your hips, then, lift your right arm and your left leg and try to touch the toes of the left leg with your right arm. Bring your hands and feet to the ground again and switch sides. Always keep your hips elevated.
Bring your resistance band under tension behind your shoulders. Arms are stretched to the sides. Bring your straight arms together in front of your chest.