Credit: Paul Drinkwater/NBC © NBC Universal, Inc.

Each week on the NBC’s reality weight loss hit Biggest Loser, viewers dig deep into the emotional back stories of the contestants — but though we occasionally get tidbits, the show’s mainstays, the fitness coaches, still remain a bit of a mystery. For instance, how much do we know about handsome Atlanta-based trainer Dolvett Quince, who joined the show in 2011?

While Dolvett has won over audiences with his down-to-earth persona, there’s still so much to learn about the 40-year-old (seriously!?). We’ve done a bit of research into Jillian Michaels and Bob Harper’s fellow fit friend, and you may be surprised by what you learn.

Scroll down for five things to know about your new favorite fitness coach:

1. He has a troubled past — which he draws on when empowering others.

Dedicated fans of the Biggest Loser may recall when Dolvett opened up about his difficult childhood in the foster care system. He and his three siblings were eventually adopted by a Jamaican couple, whose only source of discipline was through physical force.

The mental and physical abuse instilled serious self doubt into the teen, but eventually he found his own strength within — an asset you uses in his trainings today. “I’m only in the position that I’m in now because that experience gave me a voice at a very young age,” Dolvett’s said. “And with that strength, I’m able to help the underdog. … I understand what it’s like to still believe in yourself when no one else believes in you and to push that out of someone.”

2. He’s tight with his teenage son.

Though he’s still young, Dolvett has a teenage son named Isiah, and according to the reality star’s Instagram account, the two are very close — just check out their adorable Christmas photo!

Just recently, he posted a pic of the two, celebrating Isiah’s driver’s license. “I remember your 1st steps,.. Now watching your 1st steps to independence.. Well that makes me smile! Love you!” he captions the shot. Aww!

3. Some of today’s biggest celebs are his clients.

Dolvett opened his first personal training studio in Atlanta back in 2004, but it wasn’t until a local radio personality talked about him on his show that word really got out. From there, some of the biggest names in Hollywood turned to him to help maintain their tight bods. Some of his major clients include actors like Angela Bassett, Boris Kodjoe and Nicole Ari Parker, Baltimore Ravens tight end Daniel Wilcox and singer-songwriter JoJo, among others.

4. He’s an active philanthropist.

While he spends his time mentoring contestants on Biggest Loser for his day job, Dolvett doesn’t stop being a do-gooder in his off-time. He is an active supporter of many nonprofit organizations, including Children's Healthcare of Atlanta, the American Heart Association, and Got Your 6, which helps veterans transition into civilian life. Jeesh, you’re making us all look bad, dude! (But seriously, how admirable is that!)

5. He just released his first book — and it has famous fans!

This past fall, Dolvett became an author for the first time with his diet/fitness book, The 3-1-2-1 Diet. And by all accounts its worth a read — in fact, Dolvett’s client and friend Angela Bassett is a big fan of the work! We’re obsessed with Angela on American Horror Story: Coven, and whatever she’s doing, it’s working.

Did you learn something new about Dolvett? Tell us your thoughts in the comments below.

Samantha Lear is an Assistant Editor at Wetpaint Entertainment. Follow her on Twitter and Google+!