When I warm up with 135lbs and 225lbs, it feels like nothing. For me, it starts getting heavy over 315lbs. However, when the weight is resting on my back, it feels good. When I got to squat down into the hole thats when I feel how heavy it is. When I put 405lbs on the bar, it certainly feels heavy. Squats only make me nauseated when I perform high reps (over 10).