A coworker asks you to help them lift a heavy mail container that exceeds the safe single-person lift limit. You are the only two people available. What is the correct approach?

Problem-solving within safety constraints is the correct approach. The sequence is: (1) use a mechanical aid if available — this is the safest option; (2) coordinate a proper two-person lift if no aid is available; (3) escalate to the supervisor if a safe lift isn't possible. Never compromise safety just because a task needs doing. USPS provides mechanical aids specifically to prevent back injuries — use them.