So you're a total beginner to the sport.  Haven't even got yourself a bike yet.  But you like the look of those bikes.  Big chunky tires, suspension fork and bling paint jobs.  The great thing about mountain biking is the freedom.  The bikes are amazing, they can go pretty much anywhere, and you can cover so much ground on them in a short space of time.  Sure it would be easier to jump on the noisy motorcross bike but think of the environment and think of your health.  Cycling is a great way to get aerobic exercise. This is the type of exercise that is most effective at promoting good health.......