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Want to be a better all-around swimmer and athlete? You should couple your swimming training with dry-land training, specifically running and biking. Swimming training makes your heart, lungs, and muscles strong, but because it is low-impact, meaning your joints do not have to bear the weight of your body.
Swimming training does not allow you to strengthen and stretch the small muscles, tendons, and ligaments in your knees, ankles, feet, and other load bearing joints in your body. These areas need a slight bit of impact training in order to get stronger and prevent injury. Add two to three days a week of jogging into your workout plan and you will see results in your strength, stamina, and physique. Running is one of the best exercises to give your muscles that toned and defined look that is hard to get when only doing swimming training.
I really like that you emphasize crosstraining into the swim training. I agree that impact training, such as running, is an important part of overall fitness. Also, the impact training will help to build stronger bones.
The dryland swim training works best for me 3 days per week. The extra difference between zero gravity and gravity has a better workout effect on the body muscles and cardio.