The decision to issue a yellow card can be made when?

A yellow card is typically issued by referees to indicate a minor infraction during a powerlifting competition. This card serves as a warning to the lifter about a specific fault that requires attention. In this context, the situation where a lifter's feet move on the platform during the execution of a lift is indeed a valid reason for issuing a yellow card. It suggests that the lifter may lose their balance or control, which is essential for maintaining proper technique and safety.

While other aspects such as inadequate depth, failure to lock knees, or elbows touching the legs can be judged during a lift, they generally result in a white or red light decision concerning the lift's validity rather than warranting a yellow card for caution. The emphasis on foot movement is significant, as it directly relates to the lifter's stability and performance on the platform. Therefore, recognizing the movement of feet as a yellow card offense aligns with the regulations of maintaining proper form and safety during lifts.