I love squats there my favorite but latley as I have been doing heavier weights I feel like an 80 year old man once I'm done. A belt curtails these problems but I dont want to be dependent on one. I think two things could be the problem. 1. Form I rest the bar on my traps and my feet a little more than shoulder width slighty pointing out I do need to be more conciuss about where my two feet are they may not always be parrlel. 2. My core walks outs are sometimes harder than the actual squat! I fear while training my upper and lower bodies I have neglected the most important part!