Kim Kardashian West is Khloe Kardashian's "body motivation".
The 32-year-old reality TV star - who has lost 40lbs after undergoing a strict diet and exercise regime - is impressed with how her sister bounced back after having her second baby and took to Instagram to praise her.
30 August 2016
She shared some bikini pictures of Kim, 35, and wrote: "My body motivation. Mrs. West."
Meanwhile, Khloe revealed she sometimes works out twice a day in order to "shock and challenge" her body.
She wrote on her website: "I definitely don't always do two-a-day workouts, but the reason that I tried them a couple of months back was because I really just wanted to shock and challenge my body.
"First thing in the morning, I would do an intense cardio workout, like running hills. It would really wake me up for the day."
"At around 5 or 6 pm at night, I would head to the gym to work on building muscles. It wasn't only weightlifting, but really any workout to build muscle mass."
However, she doesn't recommend it as a permanent measure.
She said: "Two-a-day workouts should only be for a very short amount of time. Athletes only do it for two to three weeks before they start their season. It's definitely not a lifestyle, and it's way too much on your body to do this for even three months.
"I timed the workouts to be right before my birthday because I was going on a vacation and I wanted to feel good – which I did!
"The downside of working out two times a day is that you have to schedule out your showers and makeup!"
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