When Using the 'Aero' Position, the Participant

When using the 'aero' position, the participant:

A) Should sit forward on the saddle with the elbows tucked underneath.
B) Should not move in the saddle but bend at the hips to lower himself into position with the elbows just under or slightly ahead of the shoulders.
C) Should sit further back in the saddle to stretch out their back and reach for the handlebars.
D) None of the above, participants should not use the aero position as it puts too much strain on the back.