The Venezuelan cutie also told us about how she struggled with confidence and battled with her weight before becoming the fitness idol she is to millions today.
Michelle said: "My self-esteem was below average, actually it was at the very bottom.
"Due to my parents divorce I lost a lot of weight and was a 40kg (6st) walking skeleton.
"I'm not sure if it was an eating disorder, but my weight was also low as mum had no money for food, so we both looked very bad for a while.
"Needless to say, that was a tough period when the neighbours had to get us food."
She continued: "Thankfully, we got ourselves together. I'm sure it was an instinct of survival more than anything else and we worked as hard as we could.
"When the money started coming in, we could then afford our first gym membership. In those days, I started without any weights in the leg press."
But finding therapy in exercise soon edged on addiction, with Lewin lifting 280 kilos.
The brunette beauty confessed: "My strive for bigger legs made me blind and they became massive. I don't work out like that anymore, I'm more into symmetry than mass.
"I'm not building, it's all about shaping. And I push myself hard during my workouts with Jimmy, who is also my husband.
"The hardest ones are when I'm being filmed and have to do the exercises maybe 10 times in a row to get the best shot – I'm seriously sore by the end."
Michelle says the made the career move into fitness by accident after she realised what a kick she got from "working out like a maniac".
She said: "My routine includes exercising twice daily, first with cardio then weight-lifting.
"I stay very low on carbs, bad fat and salt, so you won´t see me out in restaurants very much. They normally don't pay attention to this! Taste is king and fatty stuff tastes better."
But it's not all work and no play as Michelle explained her carpe diem attitude: "I do allow myself cheat days and alcohol.
"How the body works is very strange, if you keep a strict diet for six days, you have to shock your body with greasy food and a lot of carbs.
"And mentally, I start thinking about this day many days before (don't blame her!) You'd be surprised by the amount of food I can eat.
"I'm not a hamburger girl, I go to buffet restaurants and go totally berserk.
"And yes, I can also go crazy on the dancefloor now and then, maybe every three or four weeks. I love to party so don't hold back on those days."
When quizzed about her women crushes – aka the globe's most infamous bootys belonging to Kim Kardashian, Nicki Minaj and J.Lo – she said: "I do respect people with great bodies.
"They can be inspirations and motivators. But I'm against butt implants or fat injections. There are so many times operations go wrong and your life could be destroyed. Or cut short.
"I'm not saying I'm 100% natural, my boobs are made by a surgeon, but still that's far safer than what some women do to their bums.
"This has also sneaked into fitness and the strive for bigger backsides has grown out of hand. Squat, girls. Don't be so lazy."
And offering her pearls of wisdom on how to get healthy for 2015, Michelle added: "Look at it this way: you have one life, no matter what.
"There are so many advantages about being healthy. You wake up in the morning full of energy, you become happier, you live longer and due to self-confidence, the sex life explodes.
"And if you're single, you're getting so much hotter on the market. Get a great body once, do it!
"If you find it's not for you, then okay, at least you tried. But once a six-pack, always a six pack. You will not want to return to your old lifestyle."
See ya down the squat rack then, Mich.
