i concur with JK-Rai, form/posture is everything. in the case of deadlifts (where most will probably get their form wrong, including me ), it is a difference between an extremely effective workout for building/toning muscles, or suffering severe lower back problems for the rest of your life (happened to one guy i know). it doesn't matter how much weight someone is pulling, if they have perfect form, they'll get massive respect from me.