For years, Bob Harper and Jillian Michaels appeared to have great chemistry onscreen while filming "The Biggest Loser" together. But a new docuseries about the NBC weight-loss competition has fans wondering if the dynamic duo actually got along in real life.

"Fit for TV: The Reality of the Biggest Loser" takes a look back at the wildly popular series, which aired on NBC for 17 seasons.

The three-part docuseries features interviews from former contestants and hosts of the show, including Harper. Michaels, meanwhile, declined to participate in the project.

Harper's comments about his former co-star have many fans buzzing about the status of their relationship. Below, we're breaking down all the essential info.

How Long Did Bob Harper and Jillian Michaels Work Together on 'The Biggest Los

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