A because its not healthy to take pills that a doctor has not prescribed you. You could get more stressed when the pills wear off and get hooked onto the pill
Answer:
Intrinsic is generally most effective
Answer:
The answer is age.
Explanation:
So for a 50-year-old, maximum heart rate is 220 minus 50, or 170 beats per minute.At a 50 percent exertion level, your target would be 50 percent of that maximum, or 85 beats per minute.