After a successful debut last year, there are limited places left for Challenge Henley and the Henley Half on 16 September.
This year has already seen 20% more entries for the iron and half-iron-distance events, and there are only 150 places left available.
The courses will be the same this year as they were last. This means a swim down the Thames on the course of the Royal Regatta with very little current, followed by a closed-road bike course and a run alongside the river on the Thames towpath.
If you fancy challenging Henley-on-Thames, head to www.challengehenley.com and book your place.