Plank on the Ball
These are active stretching exercises that elongate and tone up the muscles while also working on improving your balance.
Lie face down with the abdomen on the ball, with the hands and the tips of both feet on the floor.
Proceed to raise one arm up towards the ceiling, twisting your trunk but maintaining both feet on the ground. Hold for 3 seconds and resume the starting position. Switch. Repeat 10-20 times each side.