Got back to the gym tonight for the first time in a couple of weeks. My right knee still feels a bit fragile - I couldn't do prayers properly for quite a time - and even today at Friday Prayers put up some resistance at one point, but I decided it was now or never. Also my throat finally seems to be back to normal so I judged I'd be able to handle the heavy breathing routine.
It wasn't easy, I can tell you. But I kept going for the full forty minutes and was still walking at the end. Now hoping to be able to get up in the morning.