Weights gym safe disc bulge l 4 5 mirror doing leg press that seated and squats and lunges i no got build up core?

Back pain: Lunges and squats really put a lot of stress on the low back. You risk converting a bulging disc into a herniated disc. Isometric exercises are better to build the core muscles. A weight lifting belt can protect the low back if you have to do the lunges and squats. Consult with a personal trainer to avoid further injury to the low back.