Few bodybuilders appear to pay much attention to how fast they do an exercise. A typical repetition consists of a raising phase, in which the muscle shortens, and a lowering phase, in which it lengthens. The research differs on which phase produces more gains in size and strength. Most studies, however, suggest that the lowering phase—the eccentric, or negative, phase—may produce faster muscle gains.

When you think of all the positive connotations associated with the word "sunshine"—love, uplift, happiness—it seems a shame that the sun is now mostly known for its role in promoting skin and eye damage. But it's true; solar ultraviolet (UV) rays can cause skin to look old and wrinkled while also leading to dimmed eyesight. UV has been implicated in skin cancer as well.