It doesn’t make sense. You’re fit, but you keep freaking out and fighting the “I can’t do its” somewhere between the start and the finish line. You’ve done the physical prep it takes to be a fitness beast. But if you want to be a formidable contender, it might be time to focus on the mental aspects of endurance. Next time you seek to put foot to pavement, clip into a pedal or step onto a playing field, do your homework first!