Football players and other athletes have worn wristbands for many years to help keep their hands dry and to wipe sweat from their faces. But players no longer keep those bands down at their wrists.

In hockey, the whistle blows, but play doesn't start until the linesman drops the puck. The centers of the two opposing teams quickly line up for a faceoff to start the play. Winning the faceoff is key to gaining possession of the puck.

Swimming, one of the safest forms of exercise, can keep everyone from toddlers to senior citizens fit. Swimming provides a cardiovascular workout and strengthens your entire body. It's kind to your joints and can help you control your weight. But foot cramps, a common problem for swimmers, can occur without warning.

Ear pain after swimming generally will represent one thing: swimmer’s ear. This is an infection that develops when bacteria enter the ear canal from the water and may emerge several days after swimming.

A bicycle is an efficient machine, but only when it's a proper fit. The correct position of the seat, pedals and handlebars in relation to your height, ensure that you enjoy an efficient and enjoyable ride.

When you watch tennis, or any other sport, you're watching a demonstration of physics, just with more cheering than the typical physics experiment. Central to the action are the three laws of motion described in 1687 by Sir Isaac Newton, the Grand Slam champ of pre-industrial science.

Shoes tend to follow basic trends and guidelines in different sports -- baseball players often use grass-friendly cleats, for example. In basketball, the tradition is to stick to high-top shoes with treads meant to grip the court.

If you are looking to add a bit of friendly sabotage to your tennis opponent’s game, consider popping a few of his tennis balls in the freezer beforehand. When a tennis ball’s temperature changes, the ball’s gas-filled core undergoes an interesting reaction.

It is a little more than 380 miles from Boston, Massachusetts, to Dover, Delaware, which is roughly the same distance midfielder Steven Gerrard covered while playing for his English Premiere League club team Liverpool FC and the English national team during the 2005-06 season.

You can burn more calories swimming than you can jogging, dancing or even doing aerobics, provided you swim vigorously and use some of the more challenging strokes. If you swim on a daily basis without increasing your calorie intake, you're likely to see serious slimming as the weight comes off.

A swim in the sea may improve your mood and health. Hippocrates first used the word “thalassotherapy” to describe the healing effects of seawater, according to Pacific Naturopathic.

The amount of skill displayed between the high school and college levels of baseball may be vastly different, but the field on which the sport is played has few differences. Consistency in the field size and layout helps prepare young baseball players if they decide to transition from high school to college athletics.