There’s a rumor around that swimming helps to build „lean muscle“. There’s no such thing as a lean muscle. They probably mean that you get more definition than size. This amazing physical activity won’t get you „ripped“, but it will improve the muscle tone.
It’s a cardio workout, just like running, but it’s easier on the joints than running. When swimming, the whole body is being used, but primary muscles are the hand, forearms, biceps and pecs, lats, groin muscles, calves, and glutes. Swimming also engages Trapezius muscles of the back. Freestyle swimming serves as a great upper-body workout.
Swimming keeps the heart rate up, builds muscles and endurance, maintains a healthy body weight, healthy lungs, etc. If you’re looking for a workout that will strengthen your lungs and heart muscle – swim! Swim at a brisk pace and your heart and cardiovascular fitness will benefit a lot.
Easy swim burns plenty of calories, around 500 per hour, which is similar to running.