2. The strength and durability of this cardio endurance is important because the strength and stiffness of the heart muscle is rapidly decreasing. It's only a few days after the exercise break, according to charles R. Pedlar (2018), the 21 marathon runners who reduced the amount of rehearsals for four weeks, significantly reduced their strength or fitness. Stopping exercise for the same time will result in a 80-90% decrease in strength.
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