Mountain biking is a fabulous pastime. It is challenging, it gets you fit, It is exhilarating, fun and awe inspiring. There are two basic components for mountain biking. Fitness and skill. Some riders are super fit others are super skilled. If you have these two attributes then mountain biking is for you. Most of us have the these capabilities to varying degrees and they can compensate one another. They can both be developed in order to master the sport. The important thing, I think is to have these skills enough so that you are having fun, and enjoyment.