'Biggest Loser' Host Bob Harper Shares Treadmill Selfie After Suffering Heart Attack, Says He's Back at 'Squar

The 'Biggest Loser' host is getting back to things... slowly.

Bob Harper is getting back to his fitness, but he's taking it slow.

Weeks after having a heart attack, Biggest Loser host Bob Harper posted a video to Instagram of himself doing a treadmill stress test on his road to recovery.

WATCH: 'Biggest Loser' Host Bob Harper Confirms He Suffered a Heart Attack, Says He's 'Feeling Better'

"Well while all of my @crossfit family is getting ready for 17.3, I'm walking on a treadmill doing a stress test," the 51-year-old TV host shared. "Talk about starting back at SQUARE ONE. I plan on being the BEST STUDENT. #heartattacksurvivor."

Good to see him taking care of himself after the scary incident, which reportedly left Harper unconscious for two days.

"Two weeks ago yesterday I had a heart attack," Harper wrote on Instagram on Feb. 27, while reassuring fans, "I am feeling better. Just taking it easy."

WATCH: 'Biggest Loser' Host Bob Harper Shares Shirtless Selfie Following Heart Attack: 'On the Road to Recovery'

The following day, the personal trainer shared a shirtless selfie, writing, "On the road to recovery. I'm required to wear these monitors to see what my heart is doing throughout the day. I feel like a robot from WESTWORLD thank you all for your kindness. You have no idea how much it helps."

Watch the video below for more on how Harper is doing in recovery.