Yes, you are very welcome indeed. I'll need you to come 10 minutes early so we can say hello and I can check you understand what we're going to do.

I don't feel like laughing. Can I still come?

Yes indeed, you are very welcome to come indeed. This practice isn't about showing up feeling happy, it's about showing up however you feel and doing the exercises (the same way you would a physical yoga class, or a trip to the gym), and see how your feel after.