Slowly but surely lengthen your arms down, get a full number of motion, and allow a little stretch at The underside. The vintage spinal erector exercises are deadlifts and entrance squats. You can do dumbbell Romanian deadlifts, and that may help. You can also do goblet squats. That should help, https://hammerstrengthdumbbells90000.ivasdesign.com/54846374/hammer-strength-adjustable-dumbbells-things-to-know-before-you-buy