A great natural advantage to swimming is the resistance effect. Water is 1000 times more dense than air, so when you swim, it’s like weight training without the dumbbells. The water itself is your weight training.
You get a full body workout when you swim that puts little stress on your joints. You engage the muscles of the upper and lower body. This includes the legs, core, the upper and lower back, the arms, shoulders and chest.
Just like weight training, swimming engages and tones muscle due to the resistance. Although running is a great cardio workout, it does little to enhance a dynamic muscular body.
Burns the Calories
A moderate-intensity workout classifies keeping your heart-rate at 50-70 % of maximum heart rate.
A rigorous workout runs at 70-85 % max heart-rate. After an intensive 30 minute breaststroke swim, you can burn up to 300 calories. This can vary according to your weight. The heavier you are, the more calories you burn. By burning 500 calories more than you eat every day, you can lose a pound of fat a week. Okay, this does not sound much. But think long-term. After a month you can lose about 4-5 pounds – almost half a stone. Multiply that by 6 months and you have lost 2 stone of body fat.
When the body is in an upright position (e.g. when run or jump),the heart has to work hard to pump blood and oxygen to and from the lower extremities. This increase demand on the heart can lead to spikes in blood pressure – not good for the heart.
The American College of Sports Medicine states: ‘Swimming works the cardiovascular system without causing major increases in blood pressure.’ Because the body is in a horizontal position whilst swimming, the heart does have to work as hard. There is almost no gravity involved, so the blood pressure stays down.
Yet another benefit swimming has over running, is the weightlessness effect in water. At the end of every stroke – breast stroke, freestyle etc, your body stretches out. Because the water holds your body up, it enables you to stretch out whilst in motion. The spine can then lengthen, elongating the gaps between the vertebrae.
Physiotherapists encourage patients with disc problems to swim because of this spine lengthening effect. It takes pressure off the discs.