Staying in shape: A case of “use it or lose it”

Fitness levels rapidly diminish when people abruptly stop workouts. Cardiovascular fitness declines within weeks, while muscle strength deteriorates after about two months. The longer a person hasn’t exercised, the longer it will take to regain prior fitness levels. To restart exercise, people should seek their doctor’s approval, especially if they have chronic conditions; build up exercise levels slowly; do the same types of exercises they once enjoyed; find an exercise partner; and track progress with wearable devices or by keeping a paper log.