because low self-esteem can lead to depression and make it hard for a person to have healthy relationships with others
Answer:
Short-
1. grogginess
2. fast heartbeat
Long-
1. Increased risk of stroke/heart attack
2. hair loss, eyesight decrease, bad teeth
Explanation:
The least likely explanation for this would be that they're training at different intervals, or one is training harder than the other.
The most likely reason is that the way the other person's genetics are most people cant gain muscle as well as others because of disease or their body structure.
Hope this helped!