The astronauts on the International Space Station run on a treadmill everyday they are in orbit. Traveling over 17,000 miles an hour 24/7 runs up a bunch of miles. Does that count?
in my experience, you can’t substitute for the real thing. You can’t, say run in place, in your room, for a even a week, and expect to feel the same when running out on a trail somewhere. You can’t just bike for an hour, and then go an expect to run hard for an hour. Well, I remember hitting a wall after biking through a calf injury. Cross-training is fine, so long as your continueing to do what else your doing.
Also the heart is more important to keep in shape than the legs. The legs can get back in shape faster than the heart.
Bobby Blue Bland I Pity The Fool (1961)
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