The Los Angeles-based trainer said getting fit is a mental
as well as a physical challenge. He can identify with the struggles of his
outsized team because as an adopted child he was mentally and physically abused
and has experienced his share of self doubt.
"I walked into an environment where education was low and discipline was high," said Quince, 40, who was born in Stamford, Connecticut, in the USA.
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Four-point component
"I understand what it's like to feel defeated and because I faced my own demons I can empower others."
Quince said fitness for people who are 45kg or more overweight, involves a lot more than push-ups.
"Health is a four-point component: emotional, physical spiritual and mental," said Quince, whose best-selling book, "The 3-1-2-1 Diet: Eat and Cheat Your Way to Weight Loss - Up to 4.5kg in 21 Days," was published in November 2013.
The fitness coach, who began his career at the YMCA where his clients included the elderly, mothers, teenagers and children, tries to chip away at people's personal doubts and past disappointments.
"People become extremely vulnerable as their bodies fatigue and they're going through transformations.
It's in that vulnerability that the concrete cracks and some light pushes in," he said.
Importance of fitness
Karate, yoga, hiking and basketball are included in his fitness regime. At the gym he suggests combining cardio training, usually running on a treadmill, with strength training to systematically target different muscle groups."Doing intervals keeps your body guessing," he explained.
Read: the complete guide to interval training
Wellness coach Lauve Metcalfe believes shows like "The Biggest Loser" can raise public awareness about the importance of fitness.
But she has concerns about the rapid weight loss, often 4.5kg a week or more, expected of contestants."A kg and a half per week is a healthier goal," said Metcalfe, who is based in Tucson, Arizona. "And the aspect of every week getting on that scale, and the shame if you haven't met (the goal), is a negative.
"Quince attributes his success in helping people get in shape to his refusal to take no for an answer."I think people don't necessarily truly love working out," he said. "I think it's more like, 'Man, must we work out? Can't we just have a drink?
"His job, he added, is to instil belief as well as to motivate people to move.
More information
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(Picture: Dolvett Quince from Shutterstock)