Arctic Enema – an ironic name given that it will have you clenching your cheeks at the prospect of sliding into ice cold water under a chain link fence, with only chunks of ice to keep you company as you swim through the pool.

All we can say is do it as quick as you can! Once you get to the other side do some jumping jacks or some running on the spot to warm yourself up. Fail to do this and you could be jeopardising your whole run.