Final answer:
During the insertion of a Foley catheter, the nurse should instruct the client to relax and take deep breaths to ensure a successful and comfortable procedure.
Step-by-step explanation:
During the insertion of a Foley catheter, the nurse should instruct the client to relax and take deep breaths. This helps to relax the muscles and reduce any discomfort or resistance during the insertion process. It is important for the client to stay calm and cooperative throughout the procedure. Instructing the client to bear down, tighten pelvic muscles, or hold their breath is not recommended and may interfere with the successful insertion of the catheter.