Forget about crunches. Toss the ab roller. These days, if you want a slimmer, tighter midriff, the secret is the physio ball. Yes, that oversize beach ball in the corner of the gym is the hottest ...
Back in 2014, we put Dustin Johnson's girlfriend, Paulina Gretzky (left), through the paces of a golf workout including use of one of the most beneficial pieces of equipment in any gym—a physio ball.
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