I hate a lot of things about the fitness industry, but over-prescribed cardio would have to be at the very top of my list. I’m not talking about walking here, nor am I referring to appropriate HIIT cardio. This is about running, cycling, stair-climbing, or elliptical cardio done for hours at or above 65 percent of your max heart rate. The anaerobic threshold factors into this, obviously, but I’m painting gym cardio in very broad strokes here so everyone will understand what I’m railing against.
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