Explanation:
Regular activities can be said to be as any movement of the body that requires the use of energy. This includes all forms of physical education like dancing, sports, etc.
Because the chemicals in them would damage your skin because of the structure of your skin cells.
The physical agents that will be required to counteract the pain and discomfort of Mr. Khan after performing his knee strengthening exercises are magnetotherapy for the strengthening of the cruciate and lateral ligaments and the littleisks of the knee, as well as electrotherapy for the Muscle stimulation of the area, in order to reinforce the tendon and muscle support of the same.