A nauseating second session

Today was our first gym session. I've arranged a deal with my local gym which enables me to bring clients in to use the facilities which is great.(thank you Shane from the Pemberton Centre, Rushden)
So, Charlie's back from his trip to Scotland and we meet at the gym at 8.40am.
On my arrival, Charlie give me some worrying news that he has had some sort of bug and as a result has had frequent trips to the toilet and not been eating properly.
Despite this, he wants to press on.
First up, the rower for a 5 minute general warm up.
Charlie sets off at 2.10 per 500 metre pace. He is wearing his heart rate monitor but as it's a warm up, I don't bother to really check it. This was a mistake. Charlie doesn't appear to be overly exerting himself but once the warm up is over, we check the HR. It's a way too high 170BPM. Twice resting heart rate is a better target for a warm up. The higher than expected HR is definitely due to his illness.
Feeling nauseous, Charlie wants to carry on so we head to the weights room. One set of lunges and press ups later and Charlie simply can't carry on.
He apologises but I tell him there is absolutely no need to.
Charlie is basically running on empty. Quite simply you can't train so soon after an illness, especially a stomach bug. It's counter-productive. Charlie needs to recover fully so as to replenish his glycogen stores and get his strength levels back up.
So, not a great start and I didn't get to unleash my workout on him.
On exiting, Charlie informs me that he will be in touch once he is fully recovered.
Next week, if all goes well, we should be training 3 days. A long endurance run and twice in the gym.