An 18 year-old male needs to exercise at 75%. What would his target heart rate be in bpm?

To determine the target heart rate for an 18-year-old male exercising at 75% intensity, we first need to calculate his maximum heart rate. The most common method for estimating the maximum heart rate is to subtract the person's age from 220. For an 18-year-old male, this would be:

Maximum Heart Rate = 220 - Age

Maximum Heart Rate = 220 - 18 = 202 beats per minute (bpm)

Now, to find the target heart rate at 75% intensity, you multiply the maximum heart rate by 0.75:

Target Heart Rate = Maximum Heart Rate × 0.75

Target Heart Rate = 202 × 0.75 = 151.5 bpm

Thus, the target heart rate for an 18-year-old exercising at 75% intensity is 151.5 bpm, which is why the answer is correct. This value is essential for individuals looking to exercise at an optimal level for cardiovascular fitness and training effectiveness.