2old - we should in theory get both medals. In doing 26.2 miles, we definitely did 6.2 
Molka, dog oil - that's the answer. Available from health food shops like Holland & Barrett, it's in a bright yellow tub. It was originally used for greyhounds' legs after they'd raced and now more and more humans are buying it. It's like a Vaseline-type substance and you just rub it in. People with arthritis use it as well. Best of all, it's less than a fiver for a tub.
No dogs are in the tub.