Good muscle tone improves coordination. When muscles are slightly contracted, they can react more rapidly if and when greater exertion is necessary. Muscles with poor tone are usually soft and flabby, but exercise will improve muscle tone.
There are two general types of exercise: isotonic and isometric. In isotonic exercise, muscles contract and bring about movement. […]

Without belaboring this issue, let us list some of the effects of drugs in athletics. First, caffeine is believed by some to increase athletic performance. In one experiment on a marathon runner, running time for the marathon was reduced by 7 per cent by judicious use of caffeine in amounts similar to those found in […]