@elastaboy: 12 thoracic vertebrae. If they lock up, your lower back pays for every lost degree of motion. Lower back soreness from reaching overhead often has nothing to do with the lower back itself. When your lats and thoracic spine are locked stiff, every overhead movement forces the lumbar spine to pick up the range it cannot find above. ㅤ 1. Dumbbell Pullover, 3x10, ribs pinned 2. Cat-Cow, 10 slow reps 3. Thread the Needle, 10 each side ㅤ Comment BASICS for my 4-week Grade 1 Mobility follow-along. $29, any level, community included. ㅤ #Elastaboy #Reboryn #ThoracicSpine #LowerBackPain #OverheadMobility