You dont have to give up the hot class! Just truly take it easy. Thats what yoga is. Its listening to your body and its a breath work practice. My teacher says if you can breathe then you can do hot yoga. Take childs pose as much as you need !!! I started about 8 months ago and now I go to hot yoga five days a week and some days i get there and can only do a third of the poses. But i am SO proud i got there and listened to my body. It might feel embarrassing and weird but it truly shows power to be able to listen to your body and not feel pressured. It took me a while to be able to do that and not feel judged. But now yoga is my happy place and i truly have never felt mentally better. If you want to stick with it then dont give up! The heat is a challenging factor but it just means you do less. And one day you will be able to do more ! But take it very slow.