It's common in martial arts demonstrations for the instructor to pick out a big guy to prove their skill. Sometimes the instructor will strike and hit big guys who stand their and do nothing, sometimes they'll lock or throw them. It's not impressive imo to toss around or strike a compliant uke. It's impressive to the untrained audience but that's it. You're right though, a diminutive woman will probably never be able to naturally build an intimidating physique. Its really just a thought on my part that training time may be better spent lifting weights and getting bigger. I'm a male and was thinking about myself in this example. If I'd have spent the time I do training focusing on getting big I'd probably impress a lot more people. Not that everyone wants to be big, I dont.