I wish! No, I'm very aware of and careful about what I can and cannot do in yoga.
No, no; last week when the class was just Glen and me, Glen did what the instructor called a half-handstand, where he was supporting his upper body on his arms and supported the lower half of his body on an adjacent wall (think a 90-degree angle, feet on wall; hands on floor). I did the opposite of that with feet on the floor and hands on the wall, trying to keep the 90 degree angle.
No handstands for me after I damaged my shoulder 18 years ago... I wouldn't think of trying it. I also don't do pushups, largely because if I do, my damaged shoulder hurts for several days afterwards. Not worth it. Then there's the diagnosed osteoporosis (I'm near borderline) that I should be careful with... (not that it stops me from going out and playing -- and falling -- in the woods). :-)