Answer:
Uhhh... sir go see the doctor, or maybe you are just really strong.
All the answers provided are correct.
Target heart rate is:
d)
Desirable minimum heartbeats needed to reach a level of activity and
maintain that heart rate necessary to improve your cardiovascular
fitness.
1) Exercise it by singing and hitting different notes, however don't go overboard
2) Make sure you don't overuse your voice, as well as trying to rest your voice when you are sick
3) Overall, have healthy habits, like not smoking and drinking a sufficient amount of water.
