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58 Forerunner
®
205/305 Owner’s Manual
APPENDIX
How can I determine my
heart rate zones?
If you know your maximum heart
rate, you can enter it and allow
the Forerunner to calculate your
heart rate zones based on the
percentages shown below. For
more information on setting your
heart rate zones, see page 51.
Zone
% of Max.
Heart Rate
Perceived Exertion Benefits
1 50%–60%
Relaxed, easy pace;
rhythmic breathing
Beginning-level aerobic
training; reduces stress
2 60%–70%
Pace comfortable;
slightly deeper breathing,
conversation possible
Basic cardiovascular
training; good recovery
pace
3 70%–80%
Pace moderate;
more difficult to hold
conversation
Improved aerobic
capacity; optimal
cardiovascular training
4 80%–90%
Pace fast and a bit
uncomfortable;
breathing forceful
Improved anaerobic
capacity and threshold;
improved speed
5
90%–
100%
Pace a sprinting effort,
unsustainable for long period
of time; labored breathing
Anaerobic and
muscular endurance;
increased power