Outside of the endurance and riding specific workouts a big focus should be on prepping the muscle/fascia and joints for hours of corrugated roads, rocky downhills and unforgiving single track. The best way to do this is to spend some time under load. In more simple terms to lift some weights. Squats, deadlifts, lunges, pull-ups and bench press should be staples in your routine. Not only will they help in your power output on those short sharp climbs but they also enhance the shock-absorbing capabilities of your limbs and torso to take up all the pounding that the rough terrain throws at you. In addition some of that training can be incorporated into at least one HIIT (high-intensity interval training) a week to simulate the kind of intensity you might experience during the race. This is a great way to train as it is novel and takes out some of the monotony of riding up a hill multiple times and challenges the body in different ways. With all the hard training regular chiropractic maintenance is a great addition to a well-planned training regime. This will help keep the body balanced and aligned which helps the musculoskeletal system function efficiently.