Participants stretch in unison during P90X training class at Fitness 19 in Chino.
Instructor Ann Alperin leads her P90X training class at Fitness 19.
Participants uses weights during P90X training class at Fitness 19 in Chino, Calif.
Participants use varying weights during P90X training class at Fitness 19.
Jovanie Villanueva of Ontario concentrates during P90X training class at Fitness 19.
Jovanie Villanueva of Ontario pushes himself doing during P90X training class at Fitness 19.
Instructor Ann Alperin demonstrates technique while leading P90X training class at Fitness 19.
