I'm having a hard time breaking through my leg plateau, my legs are losing size along with my ass. My calves are ok. Currently my leg workout consists of leg press machine, 4 sets of 12,12,10,10. Then leg extensions 4 sets of 15,12,12,10, then lying leg curls 4 sets of 15,15,12,12. I do dead lifts on my back day. I can’t do squats with the bar behind my neck, I get a very bad pain in my neck, I had a buddy watch my form and he said all was good, but the pain isn’t healthy. My strength has stayed the same but my legs lost and are losing a lot of size. I have been doing this workout for about a year now and never had a problem. The rest of my body is growing, I was thinking of adding hack squats to the workout. Any ideas guys?