She needs to reduce her waist size a bit more, which she can do by doing more muscle-strengthening exercise to lower her percentage of body fat.

CNN: Secrets of women with healthy hearts

So staff are less confident in their PE teaching abilities and there has been a steep drop in the numbers of children doing two or more hours exercise a week.

BBC: The challenge of providing good PE lessons

You will benefit more from doing regular gentle exercise for a good length of time, than exercising very vigorously for a short length of time or infrequently, they say.

BBC: Can too much exercise cause a stroke?

Men who were the most physically active, doing 15 hours or more of moderate to vigorous exercise each week by playing football, baseball or basketball for example, had sperm counts which were 73% higher than those who were least physically active.

BBC: Prolonged TV viewing linked to lower sperm count