Butch Harmon: 'Rory McIlroy may be bulking up too much'

Butch Harmon has warned world number one Rory McIlroy that he is in danger of damaging his game by bulking up "too much".

Harmon was commenting after 25-year-old McIlroy released a video this week demonstrating his workout routine, in which he revealed how he has transformed his physique.

"If you look at Tiger [Woods] and how much stronger he got as he went on, you look at Rory the way he is now," Harmon told Irish radio show Off The Ball.

"The only caution I would give Rory is, I see a lot of pictures of him lifting a lot of very heavy weights and I think, in a way, you can almost hurt yourself in the gym if you get too bulky. Hopefully, he will keep his body tone down, more like a Dustin Johnson, who's in absolutely perfect physical shape to play golf"

McIlroy is currently preparing for The Masters, where he will be aiming to complete a career clean sweep of major titles.