Ray Yang, a celebrity trainer, takes a selfie before the start of a workout session during TV program "The Body Show" at a gym in Seoul, September 19, 2015. Looks no longer centre only on the face in beauty-obsessed South Korea, where more women are hitting the gym to improve muscle tone and physical health. As the ideal of beauty evolves in a country that is a trendsetter in cosmetics and the pursuit of plastic surgery, women's fitness has become a growth business, say purveyors of health products, from diet supplements to dumb-bells. (Photo by Kim Hong-Ji/Reuters)

Dozens of people practice martial arts before the regional Government's headquarters in Barcelona, Spain, 27 July 2020, as a protest against the closure of gyms and martial arts centers in the region imposed by the Catalan Government due to a surge in coronavirus cases. (Photo by Enric Fontcuberta/EPA/EFE)

Muay Thai boxer Nong Rose Baan Charoensuk, who is transgender, trains at a gym in Buriram province, Thailand, July 3, 2017. Born Somros Polchareon, Rose said she identified as a woman at an early age and began wearing makeup and a sports bra in the ring.(Photo by Athit Perawongmetha/Reuters)

Jo Swinson, Leader of the Liberal Democrats takes part in some boxing practice as she campaigns at a boxing gym for young people on November 13, 2019 in London, England. The United Kingdom will hold a general election on December 12. (Photo by Leon Neal/Getty Images)

A woman, covered in mud, dances during the traditional “Bloco da Lama” or “Mud Block” carnival party, in Paraty, Brazil, Saturday, February 14, 2015. Revelers in the seaside colonial town threw themselves into deposits of black, mineral-rich slime, emerging covered head-to-toe in the sludge. Bikinis and trunks disappeared beneath the mud, which highlights both gym-pumped pectorals and beer-fed guts. (Photo by Leo Correa/AP Photo)

79 year old Constance Ngubane spars in the ring as she takes part in a “Boxing Gogos” (Grannies) training session hosted by the A Team Gym in Cosmo City in Johannesburg on September 19, 2017. The grandmothers, many of whom are over 70 have been training with coach Claude Maphosa and claim that they no longer suffer from the ailments they had before, and are stronger than ever. The grannies travel from all over Cosmo City for the twice weekly sessions. Coach Maphosa is in the process of planning events in other areas for grannies who have been inspired by the story, to join in. (Photo by Gulshan Khan/AFP Photo)

In this January 11, 2018 photo, a skater jumps a ramp during the inauguration of a new recreational space for skateboarders, created in an abandoned gym at the Educational complex Ciudad Libertad, a former military barracks that the late Fidel Castro turned into a school complex after the revolution in Havana, Cuba. Foreign skateboard enthusiasts supply their Cuban counterparts with boards and other equipment. (Photo by Ramon Espinosa/AP Photo)

A Utah Valley University student walks down the bright green lanes painted on the stairs from the gym Thursday, June 18, 2015, at Utah Valley University, in Orem, Utah. Utah Valley University spokeswoman Melinda Colton said the green lanes were intended as a lighthearted way to brighten up the space and get students attention. (AP Photo/Rick Bowmer)