Rock'n'roll: May is the turn of Michael Kennedy, 73, from Hunstanton in Norfolk, who spends two hours every day, except Saturdays, moving rocks to build a seawall. He has shifted more than 200 tons of rocks over the past 14 years to prevent erosion of cliffs lining the coast. He said: 'I used to walk to Old Hunstanton and back, two and a half miles every day, but that wasn't enough physical exercise for me. I started moving rocks and now I can't stop. It's better than sitting in an armchair. I'll do it for as long as I'm healthy.'