Even before Cambridge University's study on the positive effect of mild physical activity we were aware that exercise was " a good thing". According to the study brisk walking is just fine, reducing your risk of premature death (via heart attacks, strokes, diabetes, take your pick from this group.

There's also a sizeable body of opinion supporting the 10,000 walking step (~8kms/5miles)/day approach to fitness. We're healthy (?) sceptics as this appears to be a round number in the manner of the "5-a-day, sure fruit's fine" manner of earlier health messages. Fitbit had a blog: we looked at the comments section and decided not to include them here; they're clearly not objective. The Harvard Medical School makes reference to "10,000 steps a day is a good goal".  

More to follow on the contraption above....