ho ho - im not physically imposing, im like 5'3. But i've got pretty wide shoulders and big arms (press ups before bed when i was growi'n) and i armwrestled a few friends, and bet em all - so then i took on most of the year, and i think my slightly better than average strength and the power of surprise helped me beat practically everyone. The rugby players were very surprised.
Thats an example of when the small guy wins, even in a strength match. The big person expects an easy ride and it makes them more voulnerable.
(as the dwarves say: When his hands are higer than your head - your teeth are level with his groin) Lol.