"The Biggest Loser" has its Season 7 live finale tonight (5/12) — which, for trainer Bob Harper, is a little like graduation time.

"I feel like a school teacher, living vicariously with my students as they go on in life," says the popular fitness expert. Harper, in fact, does stay in touch with quite a few of his former "Biggest Loser" contestants, "through emails, Facebook, text messaging. Certain people strike a heartstring," he says.

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