"Rob works out in beast mode," Gunnar tells People. "When I see him, we laugh, have fun and he gets after it hard at the gym. I know he can do this."
On the agenda for his workouts are intervals and strength movements. "It's about getting his heart rate up and keeping it up," his trainer says. But Rob won't be weighing in every day. "I don't have a scale, I'm not big on measurements," Gunnar explains, "Until a person looks in the mirror and is happy with themselves, you have not reached your fitness goals."
Rob's apparently pretty busy, according to the trainer, which can make fitting in workouts a challenge. "People forget he's on the show, he has a sock business and he has other interests," Gunnar says. "He'll start seeing it and feeling it in a couple of weeks and will see major changes in six to eight weeks."
Rob recently joked on Twitter that he was "trending for being fat," but it's good to see he's taking his health seriously and trying to get back into shape. Go get 'em, Rob!