Ready position: The Ready position is key to almost every mountain biking maneuver on technical terrain (most trails we encounter). This link provides excellent reminders of how to be “ready” on your bike.
Lateral bike movement: This video reviews moving your bike from side-to-side to using your windshield wiper arms to maintain control/balance on trail features. It’s a skill that is especially useful in cornering.
Bike-Body position: This video goes over bike/body position when climbing and descending. Keep in mind that we move the bike, rather than our bodies.
The Learning Curve Mountain Biking 