Brace your ears

Let’s be honest: your dad’s favourite hobby is telling everyone how much harder things were back in his day. If you have to listen to him brag about his "prime" one more time, you deserve a reward.

We’re giving you 20% off 5K, 15K, and Infinity tickets. It’s the perfect incentive to get yourself on a course and distract you from the endless cycle of dad advice and bad puns. Think of it as a tax write-off for your patience.

Use code DADJOKE at checkout. You’ve earned it.

Dads have an impressive ability to endure things that would break ordinary people. We aren't talking about the Arctic Enema plunge or the Electroshock Therapy finish, we’re talking about their commitment to terrible humour.

To celebrate Father's Day coming up, we’ve rounded up the absolute worst dad jokes currently circulating the Tough Mudder community. For instance: What did the mud say to the trainer? I’m stuck on you.

We’ve compiled the full list on this Instagram post. Read through them now so you can mentally prepare for the puns he’s definitely going to drop at the start line.

This promotion is valid until 21 June 2026 at 11:59PM BST. This offer is valid for all 2026 Tough Mudder UK 5K, 15K, Infinity. Offer is not valid on any of the following: US/Germany events, merchandise, spectators, Kids by Spartan, season passes, race passes (including post-event ticket offers), tickets purchased onsite at an event location, or World's Toughest Mudder. To redeem this offer and gain 20% off, use code: DADJOKE at the checkout. This promotion cannot be retroactively applied and cannot be combined with any other offers, discounts, or promo codes.