Forward reach, trunk rotation with ball ("Crunch, oblique" Core/abdominal strengthening, reaching with ball)

Lie on your back with your knees bent and your feet flat on the floor.
Hold a foot ball between both hands.
Flatten the small of your back against the floor and tuck your chin in.
Reach the ball towards one knee, lifting your back off the floor.
Hold.
Keep you chin tucked in as you lie back down.
Repeat towards the other leg.