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Heidi's Running Mates

Kim Kardashian! Miranda Kerr! The Project Runway host is getting fit with a slew of famous friends

KIM KARDASHIAN

Turns out it actually is hard to keep up with the Kardashians! Klum credits the reality star with keeping her motivated during their June 26 early-morning jog. "We took a walking break and she was the one who pushed us to start running again," blogged Klum. "We did four miles!"