When Ayush Shetty was playing at the World Junior Badminton Championships a few years ago, the Indian shuttler had a predetermined tension for his racquet string in his mind. But when he landed at the gut-string counter, Tim Willis, head of stringing at sports equipment manufacturer Yonex, reckoned he might need a little higher tension to produce a more attacking game. “Stringing is a crucial part of any racquet sport. I think Indians are more calculative about their game and less about these details but it does play a role in the career of any shuttler,” Willis told The Indian Express . “Strings guide the gameplay in badminton. It gives you precision and the ability to control the game,” he added. Why surface tension matters Surface tension is the tightness of the string on the racquet. While higher tension makes the string bed firm and offers more control, lower tension makes it softer and gives it more power.  “Knowing tension for strings is like knowing your diet plan.…