Photo 1: Photo of mountainbiker tackling descending section. The rest of this entry dissect piece by piece from this photo.
Photo 2: Checking 4 feet ahead of the direction you wants to go. Always find easy way out route.
Photo 3: Left arm a bit straighten, elbow close to abdomen to avoid hitting the tree.
Photo 4: Fingers on brake to micro adjust the traveling speed.
Photo 5: Coasting position with crank level to the ground. This is to avoid horizontal obstacles (e.g. roots, rocks & berms).
Photo 6: Firm grip on pedal & handlebar. Flex and relax muscle (no stiff join). Bend your knee & elbow to absorb vibration & impact. Curl abdomen and take the butt slightly behind (and below) the saddle to compensate center of gravity.