1. Do a warm-up swim before assuming the core position. Move around in the water for about five minutes before swimming the breaststroke. You could do another ... 2. Stretch your neck, arms, hips, and legs while in the water. There are many ways to stretch these muscles. For instance, stand on one foot and pull your heel ... 3. Start in the core position in the pool. Place yourself laterally in the water with your arms extended straight in front of you and your legs behind you ...
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