A large group of people participating in a marathon

Events & challenges

Whether you want to take on a full marathon or something a little less daunting, we've got a great selection of events to dive into.

    Marathons and Half Marathons

    An eye-level, medium shot showing the historic Pulteney Bridge and the River Avon in Bath, England.

    The Bath Half

    The Bath Half Marathon is a 'big city' race, starting and finishing in the World Heritage City of Bath. Suitable for all abilities, this course is fast, with proven potential to set a new personal best.

    The Big Half

    The Big Half is a vibrant, inclusive half marathon with a fun, festival atmosphere taking place on 6th September 2026.
    A low-angle shot of the historic Edinburgh Castle perched atop a jagged, rocky cliff in Scotland. The fortress stands prominently against a bright blue sky with wispy white clouds. Foliage frame the bottom of the image.

    Edinburgh Marathon

    The Edinburgh Marathon Festival is the biggest running festival in Scotland and the second biggest in the UK.
    Jim Bourne wears a dark blue marine conservation society running vest. He is photographed running the London Marathon. Tower bridge can be seen behind him along with lots of other runners

    London Marathon

    Run through the heart of London, soak up the incredible atmosphere, earn that famous finisher’s medal and raise vital funds for the ocean.
    Runners in fancy dress costumes are stood underneath the finish line of the London Landmarks Half Marathon.

    London Landmarks Half Marathon

    Expect musical performances, fancy dress, DJs, dancers and themed cheer stations throughout the iconic London route.
    A happy runner with curly hair and glasses, wearing a black t-shirt, celebrates as she approaches a finish line. She is surrounded by supporters

    Hackney Half

    A Half Marathon with a difference. Set your 2027 off to the right start by calling your crew to the Hackney Half start line on Sunday 16th May.
    Runners are photographed going past a London landmark as part of the London Parks half marathon.

    Royal Parks Half Marathon

    Run through four of London's eight Royal Parks on 11th October.

    Runs and walks

    An evening view of the Edinburgh skyline from Calton Hill, featuring the Dugald Stewart Monument in the foreground and Edinburgh Castle illuminated in the distance under a twilight sky.

    Edinburgh 10k

    The 10K falls on the Saturday of the Edinburgh Marathon Festival weekend and is run in the stunning surroundings of Holyrood Park.
    A runner on a paved path next to a rocky shoreline and the sea.

    Great Scottish Run

    With a city centre start and finish, the AJ Bell Great Scottish Run is a celebration of everything that is great about Glasgow and a fantastic opportunity to raise money to save our seas.
    A group of smiling people wearing traditional red tartan kilts and black T-shirts hiking through a sunny, wooded area.

    The Kiltwalk

    Get your tartan on, and join with friends, family or colleagues on one of Scotland’s Kiltwalk events. There's no minimum fundraising target and every single penny raised goes straight to Marine Conservation Society.
    A runner's feet running on a road

    Ultra Challenges

    Looking for a challenge – to test yourself, to get in shape, or bond with friends on a weekend adventure? If so, an Ultra Challenge®is for you – and you don’t need to be a budding elite athlete – they’re for everyone, take it on at your pace!
    The sun is pictured rising from the top of Mount Snowdon. The sky is pink and orange as the sun is slowly rising, its beams reflected on the water in the valley

    Snowdon at Night

    Trekking Mt Snowdon (1,085m) during the daytime forms a great challenge, but by using torches to light the way and having the moon as a backdrop, summiting at night brings another sense of achievement.

    Swims

    Swimmers at Lake Windemere

    Great North Swim

    Taking place 12th - 14th June 2026, the Coventry Building Society Great North Swim is a great way to meet like-minded people and set yourself an open water challenge in the great outdoors at the UK’s biggest open water swim event.

    Family events

    Participants at the inflatable 5K track

    Inflatable 5k Series

    The World's Largest and Best Inflatable 5K Obstacle Run! Get ready to experience the most exhilarating and unforgettable experience of the year!
    3 common dolphins swimming in and out of the ocean

    Pay in your fundraising money

    Thank you for raising money to recover the health of our ocean.

    Pay in