Motion sensors could help tennis players serve an ace

A TENNIS player’s first serve can make or break their title chances, but identifying the nuances in arm, shoulder and wrist motion that make the difference between an ace and a fault is tricky. Wearable motion sensors could help. While it is possible to analyse high-speed video of a player’s serve, this is expensive and labour intensive. So Amin Ahmadi and colleagues at Griffith University in Brisbane, Australia, have developed a cheap, wearable system that gives instant feedback on a court-side laptop. Three matchbox-sized gyroscopic sensors are taped to the chest, upper arm and hand of the tennis player,
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