I had a L4/5 TLIF one year ago next week. I felt good and have been very active but not crazy. The PT I did was ok but not helpful enough for my residual leg muscle atrophy (caused by the nerve impingement and poor walking/posture for years). So I've been seeing a personal trainer who has been very helpful with pinpointing exercises for my leg and hip pain. But she gave me some arching exercises that may have hurt my fusion. Does anyone know anything about such a thing happening after arching the low back and mid-back?