Garmin Forerunner 50 Owner's Manual page 23

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