Garmin 305 Owner's Manual

A

PPENDIX

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 

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