Bob Harper, the fitness guru who was a trainer on and later the host of weight-loss competition The Biggest Loser, suffered a heart attack two weeks ago, according to TMZ.
Harper blames genetics for the heart attack, since his mother died from a heart attack.
For now, doctors are limiting his exercise regimen to walking.
A doctor who also happened to be in the gym performed CPR and even used a defibrillator to keep Harper alive.