I don't mean to be snarky, but when has "putting you body weight behind the tool" been a mechanic trick? No matter what kind of fastener/tool you're working with, I'd say a mechanics trick is to AVOID situations where a slipping tool, or the threads (as you hope) breaking free would cause your momentum to cause an adverse outcome (smashed fingers, tool striking a carbon frame, damage to neck etc.).
I can appreciate you sharing your experience, as it is an important lesson to learn and pass on, but the title seems a bit misleading. As if an instructor in a professional mechanic school ever whispered to you, "Let me tell you a secret. Place your feet way back here, and lean all of your body weight on the handle of this wrench...."
-Jeremy