He mentioned it once, in passing, on his second day — an old running injury, the kind that flares on anything with a deep bend. Most apps would have logged it and moved on to the next generic template.
His coach didn’t. Deep lunges quietly disappeared from the plan. Step-ups showed up instead, then box squats a few weeks later, once three clean sessions in a row said the knee could handle more. Nobody had to re-explain it. It was just already known.