12 x 30-day challenges: How to maximise your fitness in a year

  A 30-day challenge is a commonly used protocol in the health and fitness world, inviting you to commit to a period in which you will either do or not make a particular action. Simple stuff – with potentially remarkable effects. As Professor Greg Whyte (the man behind multiple celebrity Sport Relief challenges) noted in these pages yesterday, “embracing a big fitness challenge and being…