It is the Digestive S<span>ystem. I think.</span>
The correct answer is hallucinogens. Stimulants and depressants affect the mood of the person regardless of his personality and thoughts. Antihistamines, usually the first generation antihistamines, cause drowsiness to a person regardless of the personality. A person that took hallucinogens, the effects of the drug is dependent on the personality and the ongoing thoughts of the patient as sensory hallucinations are often based on the person's ongoing thought processes and dysregulating it in the brain.
Not enough detail.
One way is the verbal Rating of perceived exertion scale 6-20
Another is heart rate range compared to their Max heart rate 220-age
He can focus on progression, increasing the intensity and time he spends on the paddleboard. I use these fitness principles as well.
