Ed Helms, Jon Cryer and Rainn Wilson took part in a gruelling triathlon on Sunday morning - all in the name of charity.
The Hangover star Helms, Two and a Half Men's Cryer and The Office actor Wilson put their fitness to the ultimate test and took on the treacherous swim/bike/run challenge during the Annual Nautical Malibu Triathlon.
Former Saved by the Bell stars Mark Paul Gosselaar and Tiffani Thiessen also took part in the race, while beloved US TV host Jay Leno cheered on his NBC Universal Team from the sidelines.
And their efforts paid off - together, the celebrities helped to raise $1.1 million (£687,500) for the Children's Hospital Los Angeles' Pediatric Cancer Resource Program.
Cryer had a particularly busy Sunday - after finishing the event, he hurried home to change and headed to the Nokia Theatre in Los Angeles to attend the 63rd Primetime Emmy Awards, where he presented the award for Outstanding Writing in A Drama Series with new TV co-star Ashton Kutcher.