I did cardio every day for some time. By the fourth day my effiency would go down as much as 30% from the first day (calories burned/distance). However, when I did two days of cardio, and then had a two days break, then on the first day after the break I did do better then before the brake, sometimes as much as 10%. Sure, it`s impossible to keep a rate of improvement like that, but it is somethink to think about.
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