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ZONE 4: VERY HARD
Exercising at zone 4 will prepare your system for competition type events and high
speeds. Workouts in this zone can be performed either at constant speed or as
interval training (combinations of shorter training phases with intermittent breaks).
High-intensity training develops your fitness level quickly and eectively, but done too
often or at too high intensity may lead to overtraining, which may force you to take a
long break from your training program.
ZONE 5: MAXIMAL
Suunto 7
89
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