Which behavior may indicate dangerous conditions for swimmers?

The behavior that indicates dangerous conditions for swimmers is running or jumping near the pool edge. This action can lead to slips and falls, posing a substantial risk of injury to both the person engaging in the behavior and others nearby. When individuals run or jump at the pool's edge, it increases the likelihood of accidents, which could result in severe injuries due to hitting hard surfaces or landing awkwardly in the water.

In contrast, staying calm and still near the edge suggests a level of comfort and safety, while waiting for a lifeguard's assistance demonstrates a responsible approach to potential emergencies. Swimming with a buddy is generally a safety practice that enhances overall swimmer safety, as it ensures that there is someone to assist in case of trouble. Thus, running or jumping near the pool edge stands out as a dangerous behavior that can create hazardous conditions for swimmers.