Training for a triathlon is hard work. Training for most any endurance event is.

However, to perform well you need to train with high intensity and quality, and sometimes it's difficult to keep the motivation up. Those early mornings - the sun isn't up yet and you're heading out to run, or driving to the pool. Or, worse yet, you're getting on the bike trainer. 

Those are tough sessions to get up for. You're tired. The sun isn't yet up. You're by yourself......