Exercising at zone 3 begins to be quite energetic and feels like pretty hard going. It
will improve your ability to move quickly and economically. In this zone, lactic acid
begins to form in your system, but your body is still able to completely flush it out. You
should train at this intensity at most a couple of times per week, as it puts your body
under a lot of stress.
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.
Suunto 7
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