The world's largest biceps belong to Mostafa Ismail (Egypt) and were measured for left arm flexed at 64.77 cm (25.5 in) and non-flexed 62.23 cm (24.5 in) and for right arm flexed at 63.5 cm (25 in) and non-flexed 60.96 cm (24 in). The measurements were taken in Franklin, Massachusetts, USA which is where Mostafa now resides. The 57th edition of the world's best-selling copyright book, Guinness World Records, is out today (13 September 2012). Picture: Guinness World Records/PA

Credit : Guinness World Records/PA