Seems the iPhone’s become a superb diagnostic tool through sound analysis — not only can it evaluate watermelon ripeness, but now it can also be used to measure the tension of tennis or squash racquet ...

Choosing proper string tension—how tightly the strings are pulled in a frame—is just as important to your game as your racquet. Too low a tension will leave you hitting the back fence; too tight and ...

When watching the pros at the U.S. Open hit with superhuman pace, it's natural to look for a shortcut to attain that kind of power. Most weekend hackers might focus on the racket, assuming that if ...