Answer to Question 1
Strenuous physical activity utilizing large muscle groups that requires a sustained increase in the use of oxygen.
Answer to Question 2
Any activity that is healthy in moderation becomes unhealthy and leads to more stress when it is overdone. Eating food, for example, is a healthy and positive part of effective living. But overeating can lead to an unhealthy existence with the added risk of disease and a compromised lifestyle. Sufficient and satisfactory sleep is a key component in reducing stress levels, but oversleeping to avoid important activities or to waste time can be detrimental. Frequently, when people oversleep, they don't feel any better. The body and mind need only a certain amount of sleep for optimum functioning. More sleep than this can be counterproductive. Natural sleep patterns are interrupted and a person may feel groggy and sluggish throughout the day.
No harm comes from watching a moderate amount of television as a diversion or distraction from the stressors of the day, but spending many hours in front of the television can prevent people from doing the important things in life. Other common activities that can become problematic when they are overdone include working, talking on the phone, surfing the Internet, playing video games, or spending time with friends. Even leisure activities such as exercising, which normally would be stress-reducing, can become troublesome. Almost anything can be unhealthy if it is done in excess.
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