Different Positions

This position is called the spread stable position. This position has the most air resistance that is inflicted upon the body because of the cross sectional area of the diver. As you can see the divers have their arms and legs at a 45° angle. This in turn increased the cross sectional area of the diver which decreases the diver's terminal velocity.

This position is called the dive position. This position has the least amount of air resistance that is inflicted on the body because of the cross sectional area of the diver. As you can see the diver has his arms and legs close to his body which limits the air resistance. This in turn increases the divers terminal velocity.

The diagram below shows the forces that act on the body during the spread stable position. As you can see there are two forces that act on the body during the fall, Air resistance, and gravity.