It is a fully recognized Olympic sport and a grass-roots environmental awareness program. It is the serene beauty of a spectacular sunset from atop a glorious vista. It is the thrill of arcing perfect turns through an ancient forest in the rain. It is equal parts cardiovascular demand, muscular strength, meditation and exhilaration.
Palapon recommend that if you love riding then ride for fun, not for fitness. With a smart, balanced strength and conditioning program to address your basic fitness you can then ride hard to hone that fitness into "mountain biking shape". Riding is a great way to take your fitness to another level, just don't come into it thinking that it is a great way to get into shape in the first place. Enjoy riding more and avoid overuse injuries by taking this approach.