California sports company K-Swiss has teamed up with trainer and "wellness coach" Jillian Michaels to develop a new line of fitness and lifestyle apparel which is being sold at Nordstrom and Amazon.

The 'Jillian Michaels Collection by K-Swiss' range features 13 styles available in sizes XS-XXL, and retails from $32.00-$90.00.

"I designed this collection with my own desires for hip, comfortable, cool-looking fitness and lifestyle clothes in mind," Michaels said.

"The performance pieces allow us to still feel sexy and feminine thanks to flattering lines and bright colours. The lifestyle pieces are meant to cross over from gym to brunch with friends."

A portion of proceeds from each purchase will go to the Alliance for a Healthier Generation, a non-profit organisation whose mission is to reduce childhood obesity by 2015.