Front Crawl…common mistakes
The common body position mistakes made are with the head position and hand and feet position during the stroke. If the head is too high over the water surface, it will cause the legs and feet to be lower under the water surface and cause the overall body position to be sloped and therefore very inefficient.
Hands and feet must be together throughout the swimming stroke as this gives the body its efficiency, allowing it to move smoothly though the water. If the hands or feet move apart it causes the overall shape of the body in the water to become wider and therefore inefficient.
The best exercise to practice perfecting the correct body position and shape is a push and glide from the poolside. The swimmer pushes off from the pool wall or floor and glides across the water surface, keeping the head central and hands together and feet touching together.