London Tree-Athlon 2012

If you've been inspired by the achievements of Mo Farrah in the 5000m and Usain Bolt in the 100m, here's a chance to have a go yourself with a run in this annual fundraiser for tree-planting charity Trees for Cities. Forget the swimming and cycling bits, this treeathlon consists of a 5km run, a 100m barefoot dash and a family-friendly festival of entertainment, art competition, food and fun, which is definitely our kind of triathlon. All participants will receive a t-shirt, and the chance to hobnob with Blur bassist Alex James, who will be running, and 80s pop star (and Simon Cowell pal) Sinitta, who'll be leading the warm-up. And you can start training now; the website has a range of training programmes available to download.