The deep squat pattern is very important for mountain bikers to have cleaned up. If you have trouble getting down into a deep squat position then this dynamic flow routine will help a lot. Use this routine on a daily basis for increasing mobility or as a warm up for a workout that requires front squats.
Please note that this routine is from the book Athletic Body in Balance by Grey Cook. Check that book out if you want to get some great insight into how you move and how that affects your riding.