The answer is:
Age
This is because if your young your organs are not as developed. When your older your body handles more because it is developed fully.
The correct answer is the first option - occipital lobe.
The occipital lobe is a part of your brain which is governs your sight and all your visual activities. It got its name from Latin, because ob means behind, and caput means head, so this lobe is located in the back of your brain.
I think the answer is the initiation stage, which is the first stage of addiction.
Yes, exercise or any physical activity will help your mental health and stress your welcome ;)