A British gym has replaced its dumbbells with human weights and they shout words of encouragement to motivate people to exercise.
Customers of Gymbox in Bank, central London, have five differently sized 'human weights' to choose from. They wear lycra catsuits with their weights printed across their chests.
The 'human dumbbells' include two dwarfs - 32-year-old Arti Shah, who weighs just 4.5 stones (30kg) and 64-year-old Mike Edwards, who weighs 8 stones (55kg).
At the other end of the scale for those with stronger muscles is 24 stones (155kg) Matt Barnard, 37.
"A lot of our members felt that lifting metal weights was boring and not especially motivating," the Telegraph quoted Gymbox owner Richard Hilton, as saying.
"They said that they had no idea what they were lifting.
"Experts in sports psychology agree that visualisation is a significant factor in improving performance and human weights are as visual as it can get.
"Our human weights will, at the gym-goers request, shout encouragement like 'Come on, lift me harder and faster' and 'You're doing great. Look at those muscles building'.
"Otherwise, they will just keep quiet and keep still as they are lifted," he added.