Karvonen / HRR
Recommended
Target HR = RHR + % Intensity × (Max HR − RHR)
Zone
% Intensity
BPM
Zone 1
40–60%
107–133
Zone 2
60–70%
134–146
Zone 3
70–80%
147–159
Zone 4
80–90%
160–172
Zone 5
90–100%
173–185
