If you have a regular exercise or fitness program, it's natural to want to progress as you find yourself feeling better. But, in order to avoid injury, don't try too much too soon.

The American Academy of Orthopaedic Surgeons advises people to increase activity gradually - not to add more than 10% per week. For example, if you usually run two miles a day but want to run five, build up gradually by increasing your mileage 10% a week.

The 10% rule also works for increasing the amount of weight you lift in strength-training workouts.

Related information: About it - Physical activity | Nutrition channel: Fitness center