Balancing and maintaining a streamlined body position are critical in swimming. Being able to control your body improves efficiency and allows swimmers to move through the water with minimal resistance. To achieve this position however, swimmers need to have strength and control of the muscles through the middle part of their body – the area known as core. This muscles in short are: the erector spinae muscles, the internal and external oblique muscles, the transverse abdominis, the rectus abdominis, and many other muscles that attach to and control the pelvis and spine, such as those that flex and extend the hip.
