The Kardashian family come in all shapes and sizes and the man behind making them look their best is trainer to the stars Gunnar Peterson.
And now he has revealed the secrets of his work with A-listers, which also include Angelina Jolie, Jennifer Lopez and Matthew McConaughey.
Kim Kardashian is well-known for her hourglass figure, but it doesn’t come easily to the reality star.
‘Obviously there’s a genetic predisposition but Kim works so incredibly hard,’ Gunnar told MailOnline. ‘Squats, lunges, sleds, and deadlifts. She’s not tall either.
‘She just trains – she’s one of the hardest working people inside and outside the gym. Just grind, grind, grind. The work Kim puts in she knows it pays off, I did some of her post-baby training too.’
In fact, the 33-year-old is so dedicated to her fitness that when she couldn’t stop talking about her workouts, Kanye West dropped by to see what was going on.
‘After a certain period of time the spouse shows up. Whether it’s with them or to drop something off,’ Gunnar reveals.
‘Kanye’s been here, it’s not jealousy it’s not like I’m f***ing anyone on the side, I don’t think they’re worried about that but what happens is their training becomes so much a part of their daily speech they want to check it out. You can’t help talking about a good session.’
The buff trainer spilled how Tom Cruise was a rare exception and didn’t drop by the gym once in the years he was working out with the actor’s then-girlfriend Penelope Cruz.
In fact, all of the Kardashians put in the effort when they are at the gym. ‘The whole family has an athlete’s work ethic, all of them,’ Gunnar said.
Khloe has been seen at the Los Angeles location on a daily basis, and the dedication is paying off.
‘She comes in every day and starts her workout between 6am and 10am,’ the trainer divulged. ‘Her boxing skills are exceptional, the technique and power is so impressive. She works hard and isn’t scared of the early morning routines.’
Meanwhile, the ever busy matriarch Kris Jenner doesn’t have time to put work on hold for working out, so makes business calls during her sessions.
‘She’s so driven. Kris comes to the gym at 6:30am and she’s on the treadmill while on her cell phone, shouting down the phone about millions of dollars,’ Gunnar said. ‘She’s everything to that franchise.
‘People accuse her of wh**ing her kids out but she hasn’t, she’s helped her kids get jobs. I think she’s done wonderful and it’s unfair for people to criticize. Kim and Khloe didn’t go to college and they’re making way more money than I am, so I’d say they’re f***ing winning.’
Interestingly, Gunnar told MailOnline that Rob Kardashian is back at the gym and working hard after gaining weight.
‘I’m never disappointed by Rob, there’s a certain ebb and flow to people’s lives and his is magnified,’ the guru explained. ‘Rob’s back on his path and he’s been working out all week.
‘It’s just a blip in the radar. He’ll look back on this year and say, “Oh remember when I got fat?” He’ll be right back on it, he’s still so young. Yo-yo dieting is unhealthy for sure but Rob’s always been in good shape, his work ethic is second to none.
‘I guess Rob hit a patch, I don’t know what he’s going through but it’ll pass. He’s sharp, super funny and dedicated. He works like an animal here and is friends with a bunch of athletes.’
Gunnar, whose journey began at a Weight Watchers meeting aged 10 when he suffered from anxiety of playing sport at school in ‘skins’ because of his ‘boobs’, may be the most in-demand trainer in Los Angeles but insists anyone is welcome to sign up for sessions providing they’re willing to work.
‘There’s a filtering process but I don’t have a velvet rope telling someone they can’t come in,’ he tells MailOnline exclusively.
‘The busiest – and most successful – people that I train always come alone. I don’t train a celebrity if it means haggling with a rep or publicist. The ones I do train aren’t clueless, maybe I can’t compete with them all physically because some are pro athletes but I can spot where you can improve.’
He exposes rapper and entrepreneur P Diddy as one of the few people who arrives with security and an entourage.
‘The types of person I train are the ones who’ll do more than I ask and always come back for more.’
Gunnar takes pride in his specialized workout routines designed for whoever he is training – and he doesn’t share that special detail with anyone.