Michaels, 51, alongside Bob Harper, 60, was one of the personal trainers on the NBC reality show, which aired from 2004 to 2016, following obese people as they attempted to lose weight as quickly as possible using only diet and exercise for a $250,000 cash prize.

The former talk show host called out Leno after archival footage of him appeared in the Netflix docuseries, showing him reading death threats to Tracey Yukich.