Yukon squatted 435x5 yesterday. Assistance work involved 315 for 3 sets of 8, 9, 10, with the final being a strip-set down to 225, 135, and 45 x 10. Noticed lately my back really tires out on squats. I think it's the bar, which is cool. It's long, I think longer than a typical buffalo bar and more curvy, so it takes more back to keep it steady certainly than a straight bar but in a different way than an SSB.