Re: Aikido against strong people...
I was teaching an intro class a few years back. One gentleman was very skeptical that I could be strong. He kept negating what I was teaching and asking "what if?" questions.
I was very patient and answered his questions and encouraged him to keep at what we were doing.
Towards the end of class we were practicing a entering motion with no throw because everyone was so new. He grabbed at my wrist as firmly as he could and pushed really hard.
We were both so surprised as he flew off my curled wrist and bounced on the floor. I literally did nothing except curl my extended wrist slightly at the perfect time.
He was nicer after that.