First was lunges, with started out easy, and then got surprisingly hard surprisingly fast. Then came the Smith machine squats.
After one set on that, I started feeling nauseous. As the minutes elapsed, I felt worse and worse, until I was lying on the rubber floor, wishing I hadn't eaten lunch. My trainer checked me out, then gave me a whiff from an ammonia inhalant ampule. It crossed my eyes, but at the same time it dismissed the nausea and lightheadedness as if someone just flicked a switch. It was amazing. Apparently this nausea reaction isn't unusual in beginners when doing legs the first time.
So we waited a few more minutes, and then I decided to go on instead of quit, so we finished up on the hip adductor machine.
I'm going to be wobbly for the rest of the day, and walking stiffly for a few days.