Stars of the 2011 World Cup-winning Indian squad, Yuvraj Singh and Zaheer Khan are aiming to break into the national squad once again. Plagued by injuries, Yuvraj and Zaheer's careers had nosedived and both were in indifferent form in the Indian Premier League 2013. The duo, last week, completed a rigorous six-week course under one of the world's leading private physical trainers, Tim Exeter. Yuvraj and Zaheer trained at Exeter's Metasport Athletic Performance Centre, in Brive-La-Gaillarde Area, a market town south of the centre of France. Exeter, who has trained the likes of soccer superstar Ryan Giggs and British racing driver Ralph Firman, shared some exclusive training footage with sports.NDTV.com