Over time, this can significantly reduce upper-body mobility— a ... your arms alternately up and down, repeating for 45 ...

Similarly, if you have low mobility in your shoulder, your back will over-arch ... with your knees slightly bent. Punch your arms up the sky as high as you can. Side bend to the left, squeezing ...

so you may not need it if you already have decent shoulder mobility. That said, if you have painful or very tight shoulders, the pendulum stretch offers a great way to loosen up the joint and ...