The American Sports & Fitness Association, or ASFA, is an organization offering bargain-priced online fitness certifications, including personal trainer certifications and various fitness class teaching certificates.

Pins and needles, defined as a tingling or prickling sensation, is medically known as paraesthesia. Temporary paraesthesia can result from a brief, harmless constriction of circulation -- for instance, from kneeling or assuming an uncomfortable position -- and goes away when you change position.

Grants for your school's athletic programs can be obtained from an array of sources and can play a significant role in helping your school's sports programs continue in times of economic hardship. Foundations often support teams in specific cities or states, or sometimes support the purchase of sports equipment.

Athletic differences between men and women have much to do with innate characteristics determined by genetics and hormones. These include height, weight, muscle mass, body fat and aerobic capacity. As a group, women do not run, jump or swim as fast as men.

The duathlon is a run-bike-run combination, multisport race. Held as a standalone race or in conjunction with a triathlon, duathlons typically range from 50 to 200 competitors.

There are no concrete requirements for becoming a basketball player. Anyone can freely play the sport, whether you simply want to shoot some hoops in the backyard or have aspirations of one day having your own line of basketball sneakers and a million-dollar contract.

You might think extreme sports such as ski jumping or sky diving cause the most sports injuries, but actually it is the most common sports that top the list. According to “The Most Dangerous Sports in America” by Bjorn Carey on Livescience.

The Armitron All-Sport watch, available for men and women, retails for under $20 in 2010. In addition to displaying the time, Armitron All-Sport watches can function as a timer and have an alarm. To use this watch properly, you need to know how to program it.

Tests of power and strength have remained a popular competitive sport throughout the ages. Since those early years, men have challenged each other in hopes to be bigger and stronger than everyone else. Over many millenniums, these tests of strength have continued.

Polo is a sport synonymous with luxury, but that does not mean that only the rich and famous can attend a match. Far from touting the exclusivity of centuries past, polo has been trying to repaint its image as a game for everyone.

Before the modern, more egalitarian age of sports began during the latter half of the 20th century, men were much more likely than women to compete in athletics. In the 21st century, women can do almost anything men do across the board, although women have better opportunities in some sports than others.

Tennis and sportswear legend Fred Perry invented the sweatband to absorb sweat from his hands and face while on the tennis court. Today, sport wristbands come in many shapes, sizes and materials. People have found uses beyond sopping up sweat. .