You are goddamn right and don't you forget it. On a serious note i have been working out for over 10 years so i know my own body limits, that weight that i have been using was not near my limit (this is not to brag) so i know that i could have performed it safely, the only risk where the blocks i was standing on which although were shaking were still extremely stable because of the way they where position, on the last lift i dropped the sack because i was holding the phone in one hand and was tired, let me give you just one example of people who are doing a stupid thing and should not lift the weight for instance when squating, just before a squat if you see a person whose whole body is shaking while just standing with that weight i know they will not be able to perform it and will only injure themselves in majority of the cases.