Riding in the "aero" position (often called 'position 3'):

Question

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Riding in the "aero" position (position 3) may cause increased flexion in the hips/spine. As the rider is stretched out in this position, and the movement of his/her upper body is restricted, position 3 may cause increased flexion in the hips/lower back, which may in turn lead to back pain. Therefore, although not inherently unsafe, this position should not be held to for an extended period of time so as to minimize the risk of injury. This position is also not safe for beginners until they have developed some base muscular fitness for spinning and have mastered simple positions and technique.

Riding in the "Aero" Position (Often Called 'Position 3')