What percentage range is the target heart rate?

• A. 60-70 percent
• B. 70-85 percent
• C. 85-95 percent
• D. 40-60 percent

Answer: (B)

The main idea is training intensity expressed as a percentage of your maximum heart rate. For most adults, aiming for about 70-85% of that maximum provides a solid aerobic stimulus, meaning your heart and lungs are challenged enough to improve fitness while you can sustain the effort for a reasonable workout. This range balances effectiveness with safety, especially for endurance-building workouts. The maximum heart rate is often estimated with the rough formula 220 minus age, so the target zone roughly corresponds to 70-85% of that value. Lower ranges, like 40-60% or 60-70%, are generally easier and better for warm-ups, cool-downs, or recovery days, not for maximizing cardio gains. Going up to 85-95% pushes toward near-max effort, which is usually not sustainable for longer workouts unless you’re an advanced athlete.