Zone 1 heart rate intensity is typically around what percent of HRR?

• A. 70-80% HRR
• B. 30-40% HRR
• C. 80-90% HRR
• D. 50-60% HRR

Answer: (D)

Zone 1 is the light-intensity level defined by heart-rate reserve, meaning how far you are from resting heart rate up to your max. Keeping intensity around 50-60% of HRR places you in a comfortable, sustainable effort that you can maintain for longer periods without strain. This level supports building the aerobic base and aids recovery, while still giving a training stimulus. You calculate it as target HR = HRrest + 0.5 to 0.6 times (HRmax − HRrest); that results in a heart-rate that's roughly halfway up your reserve, which many programs designate as Zone 1.

Ranges like 70-80% or 80-90% HRR shift you into more demanding zones that emphasize endurance work or higher effort, while 30-40% HRR is typically considered very easy or recovery-level and not the standard Zone 1 in many schemes.