Poor Physical Condition
Some individuals are at a higher risk of an ankle sprain because they're in poor physical condition. This doesn't necessarily mean an individual is overweight. It usually means their ankles aren't flexible enough or strong enough to handle the level of physical activity the individual is participating in. This is often the case with athletes who partake in sports too quickly after time off. It can also be seen with individuals who begin exercising or amp up their level of exercise too fast.
When someone is out of shape, they need to build up their range of motion and stamina gradually. The more strain individuals put on their ankles, the more likely an injury is. Muscle fatigue can cause an ankle to become unstable and roll outward. It's better for individuals to build up their stamina and muscles slowly over time than to go too fast and injure themselves. One thing individuals can do is talk to a personal trainer about how to safely move up their activity level.