but his invention was designed to “grind air” rather than corn, with resistance provided by a system of weights. 19th-century penal treadmills resembled large, wide wheels fitted with steps.

Alongside the air bike, SkiErg and rowing machine ... if not three times the price of the more typical motorised treadmills that are currently on sale, but this is physically and metaphorically ...

And while getting outdoors in the fresh air and sunlight has a ton of unmatched benefits, sometimes hopping on a treadmill or walking pad is more manageable, especially in bad weather. But knowing ...