Here’s a fun thought: Next time you watch the fast-paced action of a volleyball game, consider how many laws of physics are being demonstrated on the court. For example, every movement by the ball or the athletes illustrates one of Newton’s three laws of motion: inertia, acceleration and action-reaction.

Swimming a two-minute 100 m could be the best of times or the worst of times. You might start out as a beginning adult swimmer, just grateful to complete the distance without stopping. With improved technique and endurance, your swim times improve, along with your dissatisfaction for your previous performance.

Your son is playing baseball and soccer. Your daughter is playing soccer and softball. Since those sports always seem to be played in the spring and fall, there are days you are literally running from one sport to the other in a matter of minutes.

The solid “thwack” of foot to soccer ball, such as when a goalkeeper like D.C. United's Bill Hamid sends the ball on a goal kick, tells you that the ball is being sent with considerable force. Sir Isaac Newton’s laws of motion allow you to determine reasonably accurately how much force is exerted at the time of impact.

A duathlon is a run-bike-run event that offers a good way to join the multisport movement. These typically range in distance from a 2-mile run, a 10-mile bike and a 2-mile run to a 6.3-mile run, a 37.3-mile bike and a 6.3-mile run.

If you've already run a 5K, congratulations on your progress so far. A 5K is no small feat for a novice runner and it can serve as a stepping stone to longer races. One of the next logical distances is the 10K.

Many materials are used in the construction of modern bike frames, and each has its pros and cons. Though their explosion in popularity is relatively recent, aluminum bike frames date back to the late 19th century; the St.

Having a sore stomach following a swim can be caused by a variety of issues, so it’s important to determine the source for proper healing and future prevention. Each swim session may be triggering pain, but it’s unlikely that swimming will cause serious injury to your organs.

Mountain bikes can scramble over roots and rocks that would stop a road bike in its tracks, but when it comes to pavement, a road bike will take the lead every time. This discrepancy in speed results from the weight of the bikes, the position of the riders and other basic differences in construction.

When shopping for a new bike, you'll not only need to select the type of bike that best suits your riding style, but also which frame size will fit you. Choosing a frame that is too large or too small can lead to discomfort, pain and even injury.

There are several million cases of strep-related diseases including impetigo each year, according to the Centers for Disease Control and Prevention. Most of these cases occur in children, which may make it difficult for active youngsters who are told they can’t go swimming or pursue other activities during an outbreak.

Fast-pitch softball is the fifth most popular girls high school sport, according to the National Federation of State High School Associations. A total of 362,488 girls played high school softball in the 2012-13 school year.