Despite the huge numbers of cyclists on the roads these days, it's surprising just how many don't know how to change a flat tyre. It's a basic skill that all should have, and particularly those who go for long spins. Here the Southern Star's fitness expert and cycling guru, Paudie O'Donovan talks you through the basics. It's not that difficult and really is one of those things that gets easier with practice. Try it at home a few times and don't get caught out when you're miles away with no other way back to base.