I’ve been doing some yoga with a dear friend for about 6 months. He’s a single amputee on one leg from the knee down. He’s in great shape as he bikes and works out and then once a week we do about a 25 minute yoga practice. Beginner II to Intermediate. I’d love for him to try an inversion. :Possibly headstand. I’m sure this would have to be against a wall at first. That I know. Just wondering if there’s any suggestions for how to begin.