【實用運動app】Tennis - StringsOK|最夯免費app-gigacircle

Manage the strings of your Tennis racquets.From Wikipedia :"Dead strings", or strings which have lost their tension, cut down on the performance of a racquet. Dead strings may also hamper a tennis player's ability to generate power and pace, and may even make their arm sore. http://en.wikipedia.org/wiki/Strings_(tennis)