I normally dont like machines goose but I had to hit the gym at oeak hour the other day and I couldn't get a rack surprisingly. There was no one roughly my height I coukd comfabley jump in with. 45 leg presses kill my back. So there was a an upside down lleg press just sitting there. Though id warm up. 8 sets later n I was satisfied to drop squats. Upside down leg press is the cadilac of leg presses. Big foot plate as well its pro made not just a snith machine like the old days. It was like heaven for my knee
And eventually you'll totally fuck your lower back due to a completely inactive posterior chain.
Fix your squat.