- On the back, slid under the crossbar.
- Particularly under stress, a interlocking gear mechanism jealous of every single tooth engagement, from the shoulders down to the first inch of the femur stump.
- Especially under stress, the gears along the back from the shoulders to the first inch of the femur stump.
- Averaging probably 95 Watts human per hour, only mild discomfort in the knees. Possibly pretty Optimum for a seventy-year-old, five or six hours per day.
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