Eddie Izzard is determined to push himself to his peak fitness after recently finishing 43 consecutive marathons - he's now undergoing training to compete in a triathlon.
The Valkyrie star has become obsessed with exercise after finishing a mammoth seven-week run across the U.K. in September (09) as part of a fundraising campaign.
And Izzard has already plotted his next challenge - he's set to swim, sprint and cycle in a long-distance triathlon race.
He says, "I've just started up swimming because I want to do Ironman now. It's where you swim for five kilometres, then cycle for 180 kilometres and then you run a marathon after that - all in one go.
"I have (become fascinated with fitness) because there's no point in throwing away all that training. Swimming is really good upper-body (training) so I've been taking lessons. They teach you how to swim properly and that's great. I just want to keep up and get more healthy. Peak fitness at 90 - that's my idea!"
And the funnyman is urging his fellow Britons to get active so they can inspire homegrown athletes who are participating in the London 2012 Olympic Games.
He adds, "We've got the Olympics less than a thousand days ahead and I want to encourage people to take something they used to do when they were a kid and start doing it again. We're all living to about 100 now - unless you want the last 30 years of your life to be going really downhill, get healthy, get fit. Then we can encourage our athletes going into the Olympics to be able to have the fittest country (supporting them)."