Too often we get ourselves worked up over every single detail, thus hindering our performance and hurting us more physically.  This work up starts in the planning stages when we begin to set our goals and then the follow through remaining rigid about getting every workout in and making sure that we meet every time we are suppose to meet.  We become so rigid that we begin to stress, the stress effects our body, then we begin to go backwards.  Find the balance, and make one of your goals to have fun.  In doing so you will remain more relaxed and most likely perform better.