Boxers should train for stamina using 2- or 3-minute bursts of activity, followed by a period of rest.

No one knows better the psychic toll of failure than professional athletes. As experts in the field of sports excellence, Venus Williams, Babe Ruth, Muhammad Ali and athletic stars like them impart inspirational words about having a healthy attitude toward winning and the lessons they learned from losing.

Both located on your thigh, the quads and hamstrings work in tandem to move your knees and hips. If one is stronger than the other, you risk injury.

Building stamina on a bike requires a consistent training program combining long and short rides, strength training and flexibility work.

Also called super tiebreakers, 10-point match tiebreakers are sometimes used in lieu of a final set when a match becomes tied at one set all or, in the case of a best-of-five-sets match, two sets all. Specific rules must be followed, and the player or doubles team who wins the super tiebreaker wins the match.

Stretching the hip flexors, hamstrings, quadriceps and groin muscles on a daily basis will help you get into the splits fast.

A third of you have a bike, but less than one percent of all trips Americans take are on a bicycle, according to Spokefly.com. Compare that with 27 percent of trips that the Dutch are taking via bicycle. That means that if you have one, your bike is mostly likely gathering dust in the garage.

Fitness apparel brand, Athleta is taking heat for putting plus-sized clothes on straight-sized models.

Some runners hate to be stuck inside on a treadmill, especially when there’s beautiful weather and great terrain available outside. Other runners appreciate the convenience of hopping onto a treadmill and getting their workout in without having to consider routes or weather. But which one is better?

Unlike most team sports, baseball games have no time limit. They can become even longer when the weather doesn't cooperate. Rain delays in professional baseball, including the major leagues, and many amateur leagues, are governed by the official rules of baseball. These rules dictate who can call rain delay and when.

Michael Phelps, Simone Biles, and other U.S. Olympians show off their skills in these amazing performances you may have missed.

The eight annual Body Issue features NFL player Von Miller; surfer Courtney Conlogue, MLB's Jake Arrieta, UFC champ Conor McGregor and 15 others.