Swimmers are not known to be efficient and smooth creatures on land.
Oftentimes because they have not been taught, or been placed in an environment to explore.
Joint movement can be likened to the flow of traffic on a highway.
If the body is tense and has limited ability to move freely, causing the signals from the brain to the muscles to be impaired.
As a result, we end up moving slower and less efficiently -- like a traffic jam.
But once the road clears, the ride will be smooth and uninterrupted.