The 'Keeping Up With The Kardashians' star looks up to her younger sister Khloe when it comes to working out.
She told PEOPLE magazine: ''She does these workouts with these sauna suits underneath. And she's just ... I've never seen someone so focused.
''I saw her naked two days ago changing. And I was, 'Oh, my God. You are my body icon.' She's never been more on fire.''
Meanwhile, Khloe previously revealed she only joined the gym initially to get away from the ''dark and toxic'' home she shared with Lamar Odom.
She said: ''My home [with Odom] was dark and toxic. At the time, my family didn't know what I was going through. It was the biggest secret I've kept. I just needed a place to go.
''The gym had a TV and I could watch 'The Real Housewives' on an elliptical. No one talked to me. I loved that solitude.
''I never thought about the number. When I started seeing that I could lose weight - because I just thought my body would never change - I started taking it more seriously and eating better.''
And the 31-year-old star also revealed she considers herself to be a ''beast'' at the gym.
She added: ''I'm a beast at the gym. I'm super competitive and I'm a sweater. I'm like, 'Don't f**k with me and don't mess up my routine.'
''I love that we [her and sister Kourtney] can work out together. Because Kim sort of prances and is super cute and gorge, while Kourtney and I are dripping wet. We're so mean to ourselves, we're like, 'Oh our butts are hanging low! And our arms!' And literally it's been a week - I'm sure not much has changed.''
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