For personal trainers and solo consultants, what happens when a client mentions something important between sessions?

A personal trainer told me the hardest part was never the workout plan. It was a client texting on Tuesday about a knee that started hurting, then showing up Thursday to a session already forgotten about, so the same exercise gets programmed anyway. Nothing was written down anywhere shared, it just lived in a text thread buried under six other clients.

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For anyone running personal training, coaching, or solo consulting with a full roster of clients, where does that kind of mid week detail actually go today, a notes app, a text thread, or just memory until the next session?