I've been trying to do interval-type training, but I am limited to very low-impact forms of exercise at the moment. I'm being treated for chronic shin-problems brought about by overuse etc., and as such I can't do things such as sprinting and jumping rope. I figured going hard on the stairmasters for 20 minutes and on the bike/eliptical for 20-40 mins might be a good substitute. Even so, on those machines I never keep a constant rate, I'm always alternating between a high level and a low level in an attempt to pseudo-replicate intervals.
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