These four exercises will wire your musceles to hit up on the ball ... TWIST This drill helps coordinate your shoulders, hips, and legs. Take your serving position and put your tennis bag behind ...

That was until I had a chat with PGA Master Professional Anders Mankert, who shared with me a simple weight transfer drill using something I had just lying around in the shed... a tennis ball!

Timea Bacsinszky, for example, incorporated both a tennis ball and a basketball. Alex de Minaur and Matt Reid, meanwhile, did a spin class with Lleyton Hewitt, who may or may not ever actually retire.