At the moment I have been forced to use a smith machine I'm just wondering how much you should take off your smith machine to compare it to your bench press. I looked and the bar is 11kg and I loaded 20,20,10,10,5,5 (70) on today and did x 5 rep's which seems good for myself especailly as I'm eating hardly anything cuttnig and getting no slepe with stress! What does this amount actually equate to? I kinda figured it's around 81kg maybe -1kg for stability? So did I really do 5 x 80kg bench press? My PB for x1 is 80kg so can I be happy! What are the actual differences I've heard that the bench is better on your shoulders because of movement and you also train stabilizing muscles, is there anything else?