HBO Real Sports Tommy Morrissey

Tommy Morrissey had to get creative to develop a solid golf swing. Morrissey studied the form of stars including Tiger Woods, Jordan Spieth and Arnold Palmer, but without a right arm, he still needed to improvise.

Now 7, Morrissey has figured out a way to unleash uncanny power on his swing. HBO's Real Sports takes a closer look at the science behind Morrissey's success in its latest edition that premieres 10 p.m. ET/PT on September 25.

Check out a preview: