That's a great exercise. I know it as a 'dorsal raise' from circuits I used to do based around a pretty good book based on Royal Marine training. Excellent counterpoint if you are obsessed with sit ups.
Very good for cyclists too. Don't cringe Robb. Perform a standard rep, then move your hands and torso to the left, repeat and then repeat on the right.
I might even show those links to my useless physio. Her remedy for lower back pain? Sit to stand. That will be sitting down and then standing up then.
I work in a ******* office. That's what I do all day.
When I told her that my back was uncomfortable during overhead squats she asked me to explain the exercise. So I did. I could see the horror in her eyes.