It all led up to a montage of their loved ones holding signs that spelled out "Will You Marry Me?
," with Michaels in the last frame holding the "Me" sign.
Harper, 51, was unconscious for two days and woke up in a hospital, where he stayed for eight days total.
He has not yet been given the OK to fly back to his home in Los Angeles, and for now can only walk around, not exercise as usual.
The fitness expert, who has taught season after season of contestants about living a healthy lifestyle, told TMZ that genetics were to blame for his heart attack, as his mother died from one.
; he has appeared on all 17 seasons but only took over as main host in 2016.
He served as a trainer on the show until 2016, when he took over as host, succeeding Alison Sweeney.
In 1999, he was cast as an extra in Melissa Etheridge's hit video for the song "Angels Would Fall." He is featured as a trainer on the United States version of The Biggest Loser reality television series. In addition to working on the show, Harper has appeared in several Biggest Loser DVD workouts.
Harper also appeared on the first three seasons of the Australian version of the show.
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