>> the star power of actress and singer ashley tisdale is part of the excitement, too. >> ashley, right here, please. >> it's all about the lift you get by refueling with low-fat chocolate milk. >> my trainer actually told me that chocolate milk is the best to refuel after a workout. >> ashley has played the part of a cheerleader on tv, so she's the perfect fit for the new "be strong" challenge. >> don't give me no pop, no pop! don't give me no tea, no tea! just give me that milk! >> you submit a video showing how low-fat chocolate milk refuels your body after a workout, and you have a chance to win $5,000 -- yeah, it's exciting -- and also a milk-mustache ad in "american cheerleader." [ up-tempo music plays ] >> ashley got things rolling by unveiling her own new milk-moustache ad at a big rally in los angeles. >> ashley is such a great role model for teens. you know, she's active, she's fit, she takes care of herself, and i think a lot of teen girls really look up to her. >> it's a perfect fit for our audience who are hard-core athletes who need to keep going, and low-fat chocolate mil