51.   And visitors need to watch out for signs of altitude sickness, particularly if they undertake vigorous exercise.

52.   He said vigorous exercise and weight training has kept him fit and trim, while he has learned to pace himself on and off the course.

53.   However, a combination of some vigorous exercise and some dieting may work best, Blackburn said.

54.   She and others point to research showing that children who get vigorous exercise during their schoolday perform better academically.

55.   Sherwin stands by vigorous aerobic exercise, at least every other day, at sweat-producing levels found in an aerobic studio or a treadmill run.

56.   She and others point to research showing that children who get vigorous exercise during their school day perform better academically.

57.   The men who did the more vigorous exercise got a better payoff in reduced risk of disease, the study found.

58.   The study found that women who did more vigorous exercise had a lower risk of heart disease.

59.   A vigorous restructuring exercise which entails massive redundancies and wage cuts has have now been put in place to prevent the collapse of the mine.