[沙田] When can you start? generic viagra effective However central that contribution may be, it is a subtle one. Determined to realise his potential, Murray was unsparing in his preparations long before he engaged Lendl’s services 18 months ago. His team of dietitians, exercise gurus and physios was already as extensive as any in the sport; his physique was already honed, his fitness extraordinary. He could also hit a tennis ball with incredible consistency.