Celebrity trainers Tony Horton (right) and Shaun T ham it up recently at the Sweat USA: All-Star Fitness Festival in Miami. (Mitchell Zachs, WENN.com)
Jillian Michaels, of The Biggest Loser fame, works up a sweat at the Sweat USA: All-Star Fitness Festival in Miami. (Mitchell Zachs/WENN.com)
Competitors warm up before the Boy and Girl Fitness Sao Paulo City 2013 contest, in Sao Paulo October 25, 2013. Some 140 men and women from the city of Sao Paulo took part in the competition, according to organizers. (REUTERS/Paulo Whitaker)
Competitors warm up before the Boy and Girl Fitness Sao Paulo City 2013 contest, in Sao Paulo October 25, 2013. Some 140 men and women from the city of Sao Paulo took part in the competition, according to organizers. (REUTERS/Paulo Whitaker)
Participants exercise during Mega Yoga Day in Kuala Lumpur October 27, 2013. The event, which aims to hold the largest gathering of yoga participation in Malaysia, also promotes national awareness of physical fitness and an active lifestyle through exercise, according to government organizers. (REUTERS/Samsul Said)