Weren't 19th-century treadmills basically the climbing machines you've been praising? https://en.wikipedia.org/wiki/Penal_treadmill https://en.wikipedia.org/wi

Weren't 19th-century treadmills basically the climbing machines you've been praising? https://en.wikipedia.org/wiki/Penal_treadmill https://en.wikipedia.org/wiki/Penal_treadmill