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Kate Upton

After scoring yet another Sports Illustrated cover last year, Kate Upton went full throttle to get in bikini-ready (or buff, rather!) shape. "We did wind sprints at the high school on the track. When the sun went down, we did bleacher drills up and down," her trainer David Kirsch explained to us. "When we were out at the beach or playground, we did hanging knee raises and the monkey bars. Whatever was around us, we did it."

Image Source: Getty / Jason Kempin
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