It is also possible to move only one arm at a time (paused stroke), where one arm moves through the power and recovery phases while the other arm rests. This is slow, but it is used frequently to teach students the movement, as they have to concentrate on only one arm. This drill technique can work well with the swimmer holding a float, however it is important not to overuse this drill as a "paused stroke" can easily become habitual and can be challenging to unlearn.