Health heart attack

After heart attack, 'Biggest Loser' host Bob Harper 'back to square one'

The 51-year-old recently shared an Instagram video of himself walking on a treadmill.

"Well while all of my @crossfit family is getting ready for 17.3, I'm walking on a treadmill doing a stress test. Talk about starting back at SQUARE ONE. I plan on being the BEST STUDENT. #heartattacksurvivor," the caption said.