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20 FR70 Owner’s Manual
Training Mode
Zone % of
Maximum
Heart
Rate
Perceived Exertion Benets
1 50–60% Relaxed, easy pace;
rhythmic breathing
Beginning-level aerobic
training; reduces stress
2 60–70% Comfortable pace;
slightly deeper breathing,
conversation possible
Basic cardiovascular
training; good recovery
pace
3 70–80% Moderate pace;
more difcult to hold
conversation
Improved aerobic
capacity; optimal
cardiovascular training
4 80–90% Fast pace and a bit
uncomfortable;
breathing forceful
Improved anaerobic
capacity and threshold;
improved speed
5 90–100% Sprinting pace,
unsustainable for long
period of time; labored
breathing
Anaerobic and
muscular endurance;
increased power