What is the difference between fast twitch muscle fibers and slow twitch muscle fibers, and how can I train each for maximum effectiveness?

Fast twitch muscle fibers are a type of muscle fiber in the human body that tends to be very strong, but the strength does not last for very long. Slow twitch muscle fibers, on the other hand, are not as strong, but they can put forth a continous effort over a longer period of time. The calf and abdominal muscles are usually slow twitch muscle fibers, while the muscles of the chest, back, and shoulders tend to be fast twitch muscle fibers.

In order to train each type of muscle fiber for maximum effectiveness, simply train your muscles and all of your bodily tissues as you expect them to be used in life. If you are training for a sport or athletic event, train your body in whatever way is going to bring the most benefit to that activity. If you are just training for general functional strength and health, then utilize many different exercise modalities, as well as differing weights and number of repetitions.