July 3, 2025 - Ironman 70.3 Atsumi, Aichi Prefecture to return June 6-8, 2025 (tentative dates). Press conference here.

June 25, 2024 - Triathlon in Tokyo is now part of the JTU  Club Support Program. We were the featured club on the Lumina Facebook page today.

May 14, 2024 - There will be a new middle-distance race in Okinawa on Nov 17. As yet, the only information is on Instagram.

May 14, 2024 - Utsukushima Triathlon in Aizu (Aug 25), Fukushima Prefecture - entries open

Apr 30, 2024 - Triathlon in Tokyo is today's JTU featured club!

Apr 22, 2024 - Entries for Takamatsu OD Triathlon open until April 30th

Apr 17, 2024 - "What Does it Mean to Be a Gaijin Triathlete?" - an article in "Triathlete" written by Alfredo Molinas featuring TnTers Katie and Madleen

Apr 5, 2024 - Entries open for Hiwasa Umigame Triathlon, Tokushima

Apr 1, 2024 - Entries open for Chiba City Triathlon

Mar 30, 2024 - Entries open for Irago Olympic & middle distance triathlons

Mar 28, 2024 - Entries now open for Mt Fuji Olympic distance triathlon

Mar 18, 2024 - New links to cycle route planning websites are now on the "Bike" page of this website. Rolling Japan and are in English; Tabi-rin is in Japanese.

Older Posts

Regular Training Sessions

We organise training sessions through our forum and LINE groups.

Wednesday (AM) - Open Water Swimming, Hayama koen  (organised through LINE Swimming group)

Wednesday (PM) - Ikego Track running (organised through Ikego LINE group)

Wednesday, 19:15 - TnT members join Namban Rengo track workout

Friday, 06:00 - bike & run hill repeats near Nigerian Embassy, Tokyo [Info on TnT Forum]

Saturday 10:00 - Open Water Swimming, Hayama koen

Sunday - Open Water Swimming, Hayama koen  (organised through LINE Swimming group)

Sunday - Oi-futo cycle training (organised through LINE Cycling group)

Members' Forum

The Triathlon in Tokyo Forum is our online community board where members can share triathlon banter, race reports, training info, and more. If you would like to join TnT and use the forum, please contact us here

TnT members-only Strava Club

You can view other members' Strava activity and see how you compare. Click here and request to join.

Who We Are

Triathlon in Tokyo (TnT) is a group of amateur multisport athletes based in and around Tokyo. We take part in everything from sprint through to iron-distance triathlon, as well as duathlon, aquathon, and swimrun. We have no formal structure, meetings, or meets; instead we organise informal training sessions through our members-only forum and various LINE groups. We do, however, have a team uniform which is available through the World Triathlon Store, along with a range of team wear.  We also receive discounts and support from our sponsors listed below.

TnT welcomes athletes of all abilities, from complete beginners to veterans. Many new members have progressed rapidly from their first Olympic distance triathlon to full Ironman in just one or two years. Members have competed at the ITU Age Group World Championships and the legendary Kona Ironman Worlds. If you are interested in joining us, please get in touch through the contact page.

Triathlon in Tokyo Annual Party 2019