New Year's resolution? "Doing more exercise," you may say.

Keeping in good shape or going on a diet are invariably popular new-year ambitions for thousands faced with rather too many inches to pinch after all those Christmas binges and huge o-shogatsu feasts in the bosom of the family.

In this age of washing machines, convenience foods and even room-cleaning robots, more and more people worry about how to stay — or become — healthy, when their daily lives often involve so little physical exercise.