Question

What is target heart rate used for?

Answer 1

Answer:

You can use your target heart rate to know how hard to exercise to gain the most aerobic benefit from your workout. You can exercise within your target heart rate to either maintain or raise your aerobic fitness level.

Explanation:

Answer 2

You can use your target heart rate to know how hard or easy to exercise to gain the most aerobic (requiring the presence of air or free oxygen for life) benefit from your workout.
hope this helps x