Registration for the annual Tree-Athlon 5K run in leafy Battersea Park is now open.
But that's not all. In Olympic year Tree-Athlon organisers want to break the world record for the most people taking part in a barefoot race at one time. So, after the traditional, shod 5km fundraiser, runners will be encouraged to ditch their trainers, find their second wind and take part in a mass barefoot 100m race.
Once the running's over, put your feet up and enjoy a family festival with live music, a free UK-native sapling tree for everyone to take home and plant, children’s games, bird box-making, a golden face painting caravan, hula hooping, stilt walkers, arts and crafts.
It's all to raise money for Trees for Cities which began life as Trees for London, promoting the Great Trees of London project and planting with local people across the city. Today it works with communities across the UK and internationally to plant trees in parts of cities that need it most.
Have you spotted their historic HQ on the edge of Kennington Park?
The Tree-Athlon takes place in Battersea Park on Saturday 15 September. Register now: www.tree-athlon.org