Taylor&Taylor

Taylor Lautner is the track-star hotness

Twilight heartthrob Taylor Lautner runs track and jumps hurdles while filming the romantic comedy Valentine's Day in Los Angeles July 30.

Lautner, 17, co-stars in the Garry Marshall film with country singer cutie Taylor Swift, 19 (pictured below shooting a kissing scene).

Twilight Sequels Loom

The superfit Taylor (Lautner) looked at ease filming several track and field scenes, including doing the pole vault and clearing hurdles in perfect track-star form.

Last week, Lautner was at Comic-Con promoting Twilight sequel New Moon with co-stars Robert Pattinson and Kristen Stewart. Taylor and the rest of the New Moon cast are set to begin shooting Eclipse (the sequel to New Moon) this fall.

For Eclipse and its sequel, Breaking Dawn, Lautner will continue to hit the gym to play the ripped Jacob Black. Taylor, who famously gained 30 lbs. to portray the hulking werewolf, has to gain 10 more lbs. in the upcoming Twilight sequels.

Lautner Worked Out & Ate Around the Clock

"I was in the gym five days a week, two hours a day," Taylor said recently. "At one point, I was going seven days straight. I had put on a lot of weight, and then I started losing it drastically. It turned out I was overworking myself. My trainer told me that I couldn't break a sweat, because I was burning more calories than I was putting on."

For the naturally athletic Taylor, working out was easy; the hard part was eating enough to keep weight on. "The actual getting into the gym and working out process was easier, but the eating was harder," Lautner recounts.

"I had to eat every two hours," he says. "At one point, my trainer said, 'Put anything in your mouth. Go to McDonald's, get the biggest shake possible. I just need to get calories in you.' Because my body fat at the time was only, like, 7.5%."

The mega-success of the Twilight franchise will keep Taylor busy (and buff!) until at least 2010. After production on New Moon wraps, its sequel, Eclipse, is set to begin shooting. After that, Breaking Dawn, the fourth and final installment in the best-selling Twilight book series, will begin shooting.

All the Twilight sequels are scheduled to be released back-to-back, with New Moon slated for release in November 2009; Eclipse set for June 2010 and Breaking Dawn the following fall.