Thousands of children across the East have been running a 'Daily Mile' as schools join the campaign to get youngsters active.
It comes as hospital admissions for obesity-related health problems rocket - up by 18% last year.
Forty years ago, an average 11-year-old boy would have had a chest size of around 27 inches and today it's 31 inches. Waist sizes have expanded too - up from 24 inches to 27.5 inches.
Exercise aligned to diet is key and schools are being encouraged to get their pupils to walk or run a mile every day.
We've been to schools in Essex and Stevenage to see how the scheme is making a difference.