Upgraditis?

There's Nothing Wrong With Your Bike

Really. I agree with Aaron.

There's simply no cure for upgraditis, but you can definitely do more to upgrade yourself. Soup up your leg muscles and better your heart rate.

Do some circuit training, weight training and cardio workouts. The next time you tackle that familiar hill, take note of your heart rate and your timing. Can you clean it up with ease and have spare energy to keep going (for the next one!)? Once you have upgraded yourself, sprinting a short uphill or taking up the endurance challenge of a long hill climb will be your breakfast. In fact, you'll want them for dessert as well.

Read on:
http://www.singletracks.com/blog/mtb-gear/opinion-theres-nothing-wrong-with-your-bike/