First,im no body builder but I lifted in highschool and played sports. I had a bad accident years ago and have disc issues that have required shots and I lost some range of motion. I joined the gym a little over 2 months ago,and my range of motion has increased,my squats and deadlifts are up. I do cardio to warm up on leg days and I started with very little weight and worked on my form. Now I'm squatting 200-250 comfortable,and deadlifting 275-325 comfortable. I just listen to my back,and all of my body now. I do physical work at times for a living so some days in the gym suck,but I feel good when I'm done. All I can say is form,form,form. Screw the weight,get your form first and the weight will increase. Good luck,we should all support each other on this thread.