Cheerleading is an effective way to stay in shape and show team spirit. It requires dedication, skill, technique, strength and flexibility, according to former national all-star cheerleader Leslie Wilson in her book. “The Ultimate Guide to Cheerleading.

Meniscus is cartilage that cushions your knee as it moves in multiple directions. It protects your knee in sports like football where you move forward, backward, laterally and on a diagonal. But when you tear your meniscus you lose this cushioning.

With apologies to Butterbean's physique, it's rare to see a boxer who doesn't possess a fit body. The abundance of boxers who are in shape is no coincidence.

The game of soccer is governed primarily by rules from the Federacion Internationale de Football Association, or FIFA. One of those areas governed by FIFA is the quality of the ball used in competition. Air pressure of the soccer ball is one of those topics covered in the laws of the game.

After running a marathon, you may feel like celebrating — but your muscles may put you out of commission. Even if you've trained and prepared for running a long distance, your muscles may feel sore. Muscle soreness is completely normal, and may start a day or two after running.

The breaststroke is a type of swimming style. The style requires coordination and timing between the muscles of the upper body and lower body.

18 speeds is a common drivetrain configuration for modern bicycles, with options for a double chainring paired with a 9-gear cassette or a triple chainring with a 6-gear cassette.

The distance of a triathlon is not necessarily the only factor in determining its toughness. The environment often plays a more important role. An ultradistance triathlon, of which the Ironman is the most recognized brand, includes a 2.4-mile swim, a 112-mile bike ride and a 26.

Throwing a javelin involves strength, speed and technique. If a thrower is deficient in one of these aspects, she can still be competitive. However, to be an elite javelin thrower, an athlete must be strong and quick, and have tremendous technique and knowledge on how a javelin flies.

Whether you are gearing up for the beginning of the season or prepping for the big game against your rivals, football drills are often used to prepare the mind and body for the game. Since football is such an interactive game, practice drills generally involve the whole team or several players working together.

Swimmers should learn as many different swimming techniques as possible, since each of them will put your body in a different position and will use different muscles.

A single speed bike requires you to exert more effort and physical strength to accomplish various courses and routes. Converting your bike to variable speed provides you the advantage of maneuverability and increased efficiency, but it will also require advanced knowledge of parts and how they work together.