


It is with heavy hearts that we announce the cancellation of The Endorphin Sport Belvoir Castle Multisport 2025.
In 23 years of organising sporting events, this is the first time we have ever had to cancel an event. Even during the challenges of Covid, low participant numbers, and personal family losses, we have always found a way to move forward. Rescheduling or adapting to ensure our community did not miss out.
This time, however, the decision, while incredibly difficult, has become necessary, for a number of reasons.
Both Dean and I are now working full-time and raising two young children. The time, energy, and financial commitment needed to deliver an event of this scale to its full potential is something we can no longer sustain.
Belvoir Castle is also an increasingly busy estate, often hosting other events that overlap with ours. Managing safety around increased traffic flow through the grounds, as well as unpredictable water levels and quality in the lake, has always been a challenge.
Additionally, the estates agreement last year to host another multisport event just six weeks before ours has inevitably diluted the market, as we suspected it may. This has had a significant impact on participant numbers, and unfortunately, we are not on track to reach the levels required to make the event viable.
We want to express our heartfelt thanks to everyone who has supported this event over the years, our amazing volunteers, passionate competitors, and generous partners. We've made incredible memories together and we are proud of the unique and inclusive atmosphere we have built.
While this may be goodbye to Belvoir, it is not the end. The Endorphin Sport team remains committed to creating supportive, family-friendly events. When the time is right and the opportunity arises, we hope to bring something new and special to life for you again.
With gratitude,
Bec, Dean and The Endorphin Sport Team
Location.
Belvoir Castle
Grantham
Leicestershire
https://w3w.co/clubbing.limit.wage
Set on the stunning landscapes of the historic estate, providing the perfect backdrop for a memorable open water aquathlon. You will be swimming in the estate's tranquil lake, finished by a picturesque run with the sights of the grand Belvoir Castle throughout.
Sunday 31st August: Children/Youths Aquathlon
Sunday 31st August - EVENT DAY
From 1:00pm: Registration for Kids Aquathlon
Transition Opens: 1:30pm
1:45pm: General Event Briefing for Kids Races in Transition
2:00pm: Youth A & B - 500m Swim/3km Run
2:30am Tri Star 3 (age 13-14) - 400m Swim/3km Run
3:00pm: Tri Star 2 (age 11-12) - 300m Swim/2km Run
3:30pm: Tri Star 1 (age 9-10) - 200m Swim/1.5km Run
4:00pm: Tri Start (age 8) - 100m Swim/600m Run
4:30pm: Club/Team Relay (teams of 3 - mixed) FOC!
Approx 5:00pm: Kids Presentation
IMPORTANT - Specific Event Briefing will occur for each individual kids race 10 mins before race start in Transition - this is to ensure they understand the course and the format.
Please listen to the commentator - we will always aim to deliver the presentation as soon as everyone is across the line so we MAY BRING THE PRESENTATION FORWARD if we can. We will try to minimize waiting around time as much as possible so you can get on the Endorphin Sport Podium.
-
↠ Exclusive racing access in a unique and stunning venue.
↠ 20+ Years of coaching and organising races for young athletes.
↠ FREE Team Entry to the Relay Races AFTER the individual races. Each member of the team to swim/run then passes the timing chip to the next team member.
↠ Bespoke Designed Eco Medal (designed and manufactured in the UK)
↠ High Quality Super soft silicone event swim cap so you can use it again & again!
↠ Fully Marked Course
↠ Professional chip timing, LIVE TRACKING & online Results
↠ Gourmet quality food vendor & Barista coffee vendor
↠ Spectator Friendly course
↠ Toilets for Competitors/spectators
↠ Baby Changing and disabled toilets
(OPTIONAL purchase of high quality organic cotton or TriDri technical Staunton Harold Triathlon tee at check out or from our website)
-
These swim sessions allow you to swim in the lake you will be competing in, fully marshalled by our swim safety team and our head coach with be on hand in the kayak to give you any support and tips should you need it.
Dates to be confirmed. Please click on the button below to register your interest. As soon as the dates have been confirmed with the estate, we will send you a booking link to secure your place.
❗Limited to 30 Swimmers each session. We are limited to only 2 practice swim sessions at this venue so please book on early to avoid disappointment.
These sessions are open to all ages and abilities. (Children will be briefed before entering the lake and accompanied on the water by a BTF Level 3 Coach)
🎟️ EXCLUSIVE to Belvoir Castle Triathlon & Aquathlon Entrants ONLY

SUNDAY 1st SEPT - Tristar/Youth A AQUATHLON
-
Open Water Swim & Run (8 – 14 Yrs)
TriStar Start: 8yrs (100m Swim/600m Run)
TriStar 1: 9 -10yrs (200m Swim/1.8km Run)
TriStar 2: 11-12yrs (300m Swim/2km Run)
TriStar 3: 13-14yrs (400m Swim/3km Run)
(Age as 31st December 2024)
IMPORTANT! Please enter your child into the correct race. This is their age on the 31st December 2024 - NOT their age on race day.
- Please note ALL under 16’s will need to complete a parental consent form BEFORE the event.
-
Youth A: 15-16 Yrs (500m Swim/3km Run)
(Age as of 31st December 2024)
* Start times are dependent on entry numbers and total numbers in each wave.
IMPORTANT! Please enter your child into the correct race. This is their age on the 31st December 2024 - NOT their age on race day.
- Please note ALL under 16’s will need to complete a parental consent form BEFORE the event.
-
*Accurate start times will be communicated to registered participants closer to race day. You will receive your competitor Information 1 week prior to Race Day and your Start Times one week before directly from Endorphin Sport. Please check your junk inbox if you have not received this information or check on our website for this information - our website will always have the latest information. If in doubt ALWAYS email us directly at info@endorphinsport.com
IMPORTANT - As part of our T&C's No refund or transfer will be given if the timings of the day are changed and as a result you are no longer able to make your event. Timings will not change drastically from the schedule here.
-
-
↠ Prizes 1st, 2nd and 3rd Overall Female & Male in each age category.
↠ Awards for Youth A , B & Junior Aquathlon based on their Final combined time over the 2 races.
↠ Age as 31 Dec 2023 ↞

Make a weekend of it?
Idyllic Lake Side Camping - Why not spend the weekend with us? Your camping spot enjoys stunning views across the estate up to the grand Castle.
Please add the CAMPING at Checkout OR book separately from our website Store.
-
↠ Lakeside Pitch overlooking the event lake, across to the Hall and Church and Event Hub/Transition.
↠Hot Showers will be provided (to campers only)
↠Toilets
↠ Water points
NB. Well behaved dogs welcome and to be kept on lead.
At Endorphin Sport Events, we do not impose cut off times as we understand the pressure it can put you under and we'd rather you enjoy the scenery and enjoy your event! This means you will receive an official time regardless.
↠ In addition, it is at our discretion as the event organiser to consider the safety of all entrants, if we feel you are continuing at the detriment to your health or safety we may call it a day on your behalf.
↠NO CUT OFF TIMES ↞
Want to join in for your first open water swim challenge or Triathlon but haven’t got a wetsuit?
We are pleased to announce that we have partnered with Tri Wet Suit Hire offering a hassle free wet suit hiring process.
All you need to do is contact us on the button below to request your exclusive savings code*, enter your measurements on their website, select your hire period (4 weeks, 6 weeks, whole season) and Tri Wet Suit Hire send your wetsuit directly to your door! No deposit, wet suits for kids and adults of all sizes, and after your hire period you have the option to return or purchase the wetsuit. Easy!
*Only available to Endorphin Sports Entrants
Endorphin Sports is one of the leading sports event organisers in the East Midlands covering currently Nottingham and Leicestershire.
In alignment with our inclusive ethos, we organise sprint distance triathlons,olympic and middle distance triathlons, aquathlons, aquabikes, swim challanges and offer Beginners Workshops and Practice sessions to ensure that if you want to get involved, then we will make it as easy and encouraging as possible.