Stevns, half Ironman Team Tvilling has met strong support everywhere they go. A large group of fans also follow their exploits on Facebook. - "In this sport my biggest challenge is to control my muscles 100 percent, and that requires a lot of energy and in turn tires out my body. Those who think that only Steen gets tired have to think again," says Peder. If Peder's spasms turn into cramps, they have to stop and give him medicine. And then the game is up.