New Delhi: Olympic silver medallist PV Sindhu said that she has been working on improving her fitness and defence in search of an elusive gold in the showpiece World Championships next week.

Sindhu, 24, has been the most consistent performer in the World Championships in the last few years with two silver and as many bronze medals, but a gold has still eluded her. The Indian ace will once again be the biggest hope as she spearheads the country's challenge at the World Championship which begins in Basel, Switzerland on August 19.