Kendall Jenner’s “favourite” body part to work out is her stomach, and she loves the feeling after her trainer Gunnar Peterson has “killed” her abs which leaves her in pain after an intense session.

The 21-year-old model – who has graced the runway for luxury brands including Balmain, Fendi and Chanel – loves nothing more than undertaking a gruelling fitness session with her personal trainer Gunnar Peterson who “kills” her abs.

Speaking on her website kendallj.com about her preferred exercises, the brunette beauty said: “My abs are my favourite thing to work out.

“I love it when my trainer, Gunnar Peterson, kills my abs.”

And the ‘Keeping Up With the Kardashians’ star enjoys feeling sore from the strenuous regime because she believes it proves she has completed the sets correctly, even if she is in pain to laugh the next day.

She explained: “The next day, it hurts to even laugh. That’s how I know I’m doing the exercises right!”

However, the reality television star feels guilty when she is having a day off and is lounging in front of the television instead of working up a sweat, but as the regret takes over her she then drops to the floor to complete some crunches.

She explained: “Sometimes when I’m watching TV, I think to myself, ‘I should be doing crunches and sit-ups right now.’ Then I get off the couch and do it.”

Photos: Instagram

And the catwalk icon has revealed not only does she maintain her fitness to help her stay in shape, she has also painted her bedroom pink to “suppress” her appetite, which was a tip her friends alerted her to after they visited an art exhibition.

Speaking previously about her diet tips, she said: “I decided to paint [my room] pink because while I was trying to figure out what I wanted to do with the room, I went to dinner with friends and they had just gone to the Human Condition exhibition at a former hospital in LA.

“They were telling me there’s a pink room at the exhibit that had an explanation of the colour choice: Baker-Miller Pink is the only colour scientifically proven to calm you AND suppress your appetite. I was like, ‘I NEED this colour in my house!”