I'd love to do a mini or sprint triathlon but just want to complete it, not compete with others, if you see what I mean. Are there any London or South East based triathlons which are quite laid back? Where you can be a bit chubby and old and no one cares if you're a bit slow? I had a look online but it was hard to tell what the atmosphere would be. I'd love to find something which is the triathlon equivalent of Park Run. Does it exist?