Pass right by the awkward StairMaster machine that limits your stepping motion to roughly 8 vertical inches, and head instead to the monstrous-looking set of rotating stairs. “Fifteen to 30 minutes on this machine will get even the most fit client gasping for air,” says personal trainer Alex Haschen. That’s because you’re literally carrying your body up an angled slope, not unlike walking up a real set of stairs or a steep incline. It’s not easy, and it’ll kill your quads and glutes in the process.
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