Of course, you can change your rides on the road bike, but during the off season there is nothing better than getting away from the traffic. Having to ride with cars & lorries on the winter roads is not only an inconvenience, the weather conditions increase the hazards. Mountain biking is a welcome escape from this and means you will not be breathing in vehicle emissions. The pure nature of mountain biking means that you are required to react to the ever-changing terrain i.e. accelerate over an obstacle or climb that sudden hill, which in turn builds power and strength.
Change can be as good as a rest & riding off road can be beneficial for triathletes and road cyclists.Ā More training options may also be psychologically invigorating.