This article describes how to swim with ease and avoid breathing issues in backstroke swimming using clear explanations about head and body positioning.
In backstroke swimming your head is aligned with your spine in a neutral position. Your face is turned upwards and you look up at the ceiling. Your chin should neither be tucked in nor extended forward.
While your body rolls from side to side towards the arm that pulls in the water, your face should always stay parallel to the water surface. Some swimmers even drill this by swimming backstroke lengths with a plastic bottle placed on their forehead.
In backstroke swimming you float on your back in the water. Your body should be balanced, which means it should be parallel to the water surface. If this isn't the case, your hips and legs will drop and it will be difficult to keep your face above water. This in turn causes breathing issues.
Sinking hips and legs can have the following causes:
While swimming backstroke, your body should roll between 30° and 45° from side to side. Your body should roll towards the side of your recovering arm when it is about to enter the water. This allows you to engage the larger back and chest muscles, which improves efficiency. It also puts less strain on your shoulders, preventing swimmer's shoulder.