I remember when I first started hot yoga I lasted about halfway through the standing poses before I had to collapse in a pile of sweaty defeat on the ground. But by the next couple of classes I was able to stick through the entire thing and I stopped feeling dizzy or sick. But I stopped going for a while and when I went back it was hell again and I couldn’t finish the class without lying down at least once. So it definitely gets better once your body gets used to it but if you stop going regularly your body will need some adjusting time again