The economy has affected everyone’s life in every aspect including working out.

Trends depend on many factors, said the survey’s lead author, Walt Thompson. Take Pilates, which dropped off the survey’s list from No. 9 last year. Thompson believes the economy made Pilates equipment and specialized instructors too expensive for clubs to maintain. He’s not sure if Pilates will make a return to the top 20, but he doesn’t expect a few of this year’s trends to stick around long.