Slowly lengthen your arms down, get a full number of movement, and allow just a little extend at The underside. The classic spinal erector exercises are deadlifts and entrance squats. You can do dumbbell Romanian deadlifts, and that should help. It's also possible to do goblet squats. That will help, https://back-exercises-with-dumbb24541.mdkblog.com/39132205/hammer-strength-dumbbells-can-be-fun-for-anyone