Treadmill bicycle.
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Previously:
https://www.homemadetools.net/forum/...288#post200050
https://www.homemadetools.net/forum/...985#post191178
https://www.homemadetools.net/forum/...738#post198044
https://www.homemadetools.net/forum/...609#post174307
https://www.homemadetools.net/forum/...945#post133746
