'Flip or Flop' Star Tarek El Moussa Shares Shirtless Pic on Instagram: I'm in 'the Best Shape of My Life'

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Christina El Moussa isn't the only one showing off her revenge body!

Days after Christina showed off her toned bikini bod, estranged husband Tarek took to Instagram to share a revealing pic of his own, noting that he's in "the best shape of my life."

WATCH: Christina El Moussa Welcomes New French Bulldog to the Family in Revealing Bikini Pic

"I shot this and was too embarrassed to share so I didn't... I know my journey has inspired many people so I made the difficult decision to post," Tarek wrote alongside the sexy snap. "This is after battling 2 cancers and a debilitating back injury. My doctor said 'You would probably never be able to lift weights again'... that motivated me to prove him wrong and get into the best shape of my life!!!"

"Thank you to my trainer @quintin_tucker for all the hard work and motivation and @pyejirsa for the amazing photos," he continued. "Remember....it's not the size of the dog in the fight, it's the size of the fight in the dog."

WATCH: ‘Flip or Flop’ Star Tarek El Moussa Says Fame, Bad Communication Is Responsible for Divorce From Christina

The Flip or Flop star has definitely been putting in some time at the gym, even multi-tasking by bringing his 6-year-old daughter, Taylor, with him to workouts.

EXCLUSIVE: Christina El Moussa Talks 'Flip or Flop's Future & Her Dating Life

Taylor was also with Christina as she debuted her new body. See more in the video below.