2. Ball Planks
Planks are quite common too, but the ball planks are on a whole different level of difficulty. The set up requires you to get into a standard push-up position, with your arms shoulder-width apart on the floor, and your legs placed on the ball. You need to maintain a straight line from head to toe. Push back a little so that your arms are ahead of your head. Hold this position for 60 seconds to really feel the muscles working.