While the AJ Bell London Triathlon has passed, here are five other physical challenges to spur you to greater fitness.
1 For fun
The Gauntlet Games is all about fun, with 5k and 10k routes available. Course involves taking on gladiators, water slides and rope swings.
September 5, Woodhall Park, £38 or £43
2 Rave and run
Take on 10k while listening to live DJs , including Marvin Humes and Jameela Jamil at Sure Run To The Beat.
September 13, Wembley Park, £37.60
3 Central London
The Royal Parks Half Marathon will welcome more than 16,000 runners on its 13.1 mile route, which starts and finishes in Hyde Park.
October 11, Hyde Park, register through a charity for £1 (but you must raise £400 or more)
4 The tough one
The Ironman triathlon is a gruelling 2.4-mile swim, 112-mile bike ride and a 26.2-mile run.
July 17, 2016, Bolton, £400
5 Cross country
The London to Land’s End cycling challenge takes in 310 miles of English countryside, passing through Salisbury and Exeter en route.
July 23-26, 2016, early bird registration costs from £99 per team member