More to the point - Why do stationary bike seats hurt so much? It has to do with the static nature of an indoor bike. While your hips move with every pedal stroke, your sit bones move constantly over the surface of the saddle causing friction that leads to pain and can eventually cause unbearable saddle sores. A rocker plate can help alleviate saddle sore pain in a few ways. First, the motion of the plate can reduce the pressure on your sit bones and distribute your weight more evenly across the saddle keeping them in a more fixed position relative to where they connect with the saddle. This can help prevent discomfort and pain in the sit bone area.
The slight lateral movement of the rocker plate engages your core and stabilizing muscles, which can help reduce the strain on your lower back and hips. This can also help prevent discomfort and pain caused by sitting in one position for an extended period of time.
