If the goal is to work the chest- get off the ball. If the goal is to increase awareness, along with neural engagement of inner unit muscles that stabilize intersegmental…than the ball may or may not be a good environment. It’s all about the client, and what they are prepared to do. Do you feel that your client is seasoned enough to get into a tabletop position and hold a plank like horizontal position? Please never load a client if they can’t stabilize in perfect posture. We will ask you about this…