Treat the coach like a knowledgeable training partner. Ask why an exercise is prescribed, ask for a swap if the equipment isn’t available, request form cues, or flag a new injury. The more context you give, the better the coach can adapt your program.
The coach reads your full training history, your current workout state, and your equipment list — so requests are answered against your actual context, not generic templates. If you ask for a substitute that targets the same muscles with the equipment you have, the coach picks from your real catalog.