1.   According to a recent survey, a quarter of people over twelve get no vigorous exercise at all.

2.   Avoid running or other vigorous exercise during the heat of the day.

3.   During vigorous exercise the brain generates chemicals called endorphins.

4.   Skeletal muscle also plays a part in propelling lymph, by massaging the ducts, particularly during vigorous exercise.

5.   Skiing is vigorous exercise, and it takes muscle power to control your skis on a downhill run.

6.   The golden rule is to begin gently and not to plunge into a sudden regime of vigorous exercise.

7.   Vigorous exercise increases oxygen consumption.

8.   Williams cautioned that vigorous exercise can carry risks.

9.   He collapsed following a vigorous exercise session at his home.

10.   Very vigorous exercise can increase the risk of heart attacks.