They are infinitesimal exocrine glands in the surface that emit an oily or waxy material termed as a sebum. This is to grease, waterproof the skin surface and over the hair of animals. In individuals, they happen in the biggest quantity on the face and scalp of the human being. Also on each part of the skin without the palms and bottom of the feet.
Dieting can motivate you. The fact that you are aware of your diet and how it can be a big step can motivate you into exercising and getting to you wanted weight of muscle mass.
True. However sometimes you could just be over using your body and causing stress to your muscles and bones therefore causing injuries a different way.