Joint hypermobility, in simple terms, is when there is “too much” movement within a joint. This occurs when the connective tissue, or ligaments, are overstretched and not stabilizing the joint the way it is supposed to.
When I was younger I was always told I have weak ankles. The solution was to wear ankle braces while running and playing soccer. Did this help? Probably not. Mentally it gave me security. However, I repeatedly sprained my ankles and now I have VERY stiff ankles after not rehabbing properly. I need to continuously work on them, especially as a runner.