Day’s new fitness regime paying dividends

Jason Day’s charge toward the US PGA Tour playoffs’ $US10 million bonus and world No.

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1 ranking would already be over if he hadn’t transformed his body.

That’s the firm belief of trainer Cornel Driessen, who has overseen a dramatic increase in world No.3 Day’s core strength and stability, while adding 15 pounds of lean muscle and stripping away over six pounds of fat.

The hottest golfer on the planet, Day has won three of his last four tournaments, including his six-shot triumph in the playoffs series opener in New Jersey on Sunday.

But Driessen says the back twinge that forced him out of last week’s pre-tournament pro-am would likely have spelled major trouble if the 27-year-old Australian didn’t have the physical preparation he’s adopted.

“If Jason had the same strength profile that he had last year he would likely be out of the FedEx Cup, that’s my professional opinion,” Driessen told AAP.

“If he did not take the three months off after the Fed Ex Cup last year, which was hard because he wanted to play in Australia especially, and do the work he needed to do, he would not have been as resilient as he is now.

“He would have played through the pain because he’s gutsy like that but in all likelihood he would have injured himself further.

“As it was he wasn’t out of the woods until the weekend so it was a truly remarkable and courageous performance.”

complaint Day suffered in the lead up to the Barclays had he not changed his ways.

Day took on South African Driessen, who also works with the likes of Henrik Stenson and Charl Schwartzel, after last year’s FedEx Cup and the trainer pinpointed core weakness as a huge limiter to his injury prevention routines.

Day bought into the training philosophy and is reaping the benefits.

“Jason is a complete professional and has done everything asked of him when it comes to what his coach Colin (Swatton) wants, to changing his diet, to doing his exercise prescriptions,” Driessen said.

“His lower core and abs are now incredible and they were close to non-existent in comparison a year ago.

“He is showing as much as 800 percent improvement in dynamic core flexion strength and significant improvements across the board.”

Day heads to the Deutsche Bank Championship at TPC Boston this week as the FedEx Cup leader with a chance to become world No.1 firmly in his grasp.

He takes confidence from three previous top 10s at the venue including a second and third.

Should he win again, he would likely be the new world No.1 as long as current No.1 and No.2 Rory McIlroy and Jordan Spieth aren’t right on his tail.

Steven Bowditch (20th) is the only other Australian certain to survive week two of the playoffs with Matt Jones (57th), Marc Leishman (61st) and John Senden (81st) left with work to be done to be in the top 70 for the BMW Championship.