I having the habit of swimming, i came from my state (ap) 3rd. Even i dont know, as to how much time one can give for swimming for maintaining good health?
Swimming is a healthy activity that can be continued for a lifetime, and the health benefits swimming offers for a lifetime are worth the effort it takes to get to the swimming pool. It works practically all of the muscles in the body (if you do a variety of strokes). Swimming can develop a swimmer's general strength, cardiovascular fitness and endurance. It does not help with bone density - you need to weight bearing exercise for that - but that is about all that is missing from what swimming could do for your fitness.
Why do you swim? For the health benefits to your heart and lungs? For the chance to be with some of your friends at the pool? Because, in your case, running every day hurts? Because you like the feeling of floating and sliding through the water? ...more
Swimming does burn calories at a rate of about 3 calories a mile per pound of bodyweight. If you weigh 150 lbs. and it takes you 30 minutes to swim one mile (1,760 yards or 1,609 meters), then you will be using about 900 calories in one hour. However, many swimmers do not swim that quickly, and many cannot swim for that distance or duration, so swimming to lose weight is not always the best plan. Swimming does exercise almost the entire body - heart, lungs, and muscles - with very little joint strain. It is great for general fitness, just not a great way to drop excess pounds.