Answer: Parietal lobe
Explanation: The parietal lobe is the part of the brain which interpret pains and touch on the body. The parietal lobe is the alarm of the body. It tells the body the consequences of any nerves it received from the sensory nerves.
For you to feel pains in the arm after a work out, is an alarm to the body that the arm has been stressed, and if this continues the arm may be damaged. This lobe interpret the pains of injury inside and out side the body. It also works together with the motor neurons during a sharp removal of the hand from a hot object.
The feeling of the pains in the arm may have not been noticed during work, because the injury been caused to the arm is still very light, and the Parietal lobe interprets it in a lighter way that the body don't notice, because the occipital lobe which is doing the work has more signal to the body at that moment. But when relaxed, the signal the occipital lobe gives the body has reduced, then the body can now notice the signal from the Parietal lobe.
