Which aerobic exercise plan is the most well-balanced?
15 minutes to warm up, 15 minutes of aerobic activity, 15 minutes to cool down
5 minutes to warm up, 25 minutes of aerobic activity, 0 minutes to cool down
0 minutes to warm up, 15 minutes of aerobic activity, and 15 minutes to cool down
5 minutes to warm up, 20 minutes of aerobic activity, 5 minutes to cool down