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Target zone Intensity % of HR
max
HR
max
= Maximum
heart rate (220-age).
Example: Heart
rate zones (in
beats per minute)
for a 30-years-old
person, whose
maximum heart
rate is 190 bpm
(220–30).
Example durations Training effect
and muscles.
Feels like:
Very exhaust-
ing for breath-
ing and
muscles.
Recommended
for: Very exper-
ienced and fit
athletes. Short
intervals only,
usually in final
preparation for
short events.
HARD 80–90% 152–172 bpm 2–10 minutes Benefits:
Increased abil-
ity to sustain
high speed
endurance.
Feels like:
Causes mus-
cular fatigue
and heavy
breathing.
Recommended
for: Exper-
ienced athletes
for year-round