What should my target heart rate be when exercising if I'm a teen?

When doing a cardio workout, there is a certain heart rate you want to reach and sustain, so that your body burns fat the most efficiently. This is called your target heart rate (THR). You want to reach a heart rate (the number of heartbeats per minute) within your target heart rate range and hold that level for at least half an hour To determine your target heart rate (THR), subtract your age from 220, then take this number and multiply by 0.6.

This is your low limit. Then take the original 220 minus your age number and multiply by 0.85. This is your high limit.

At the most intense part of your workout, your heart rate should fall somewhere between these numbers, but never above.

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