> Nobody does slow speed on treadmill. Anecdata: People with bad knees (like me) do. > climbers are heaven comparing to treadmills. Anecdata: Not if you've g

> Nobody does slow speed on treadmill. Anecdata: People with bad knees (like me) do. > climbers are heaven comparing to treadmills. Anecdata: Not if you've got bad knees (like me).