Ok, so I sorta invented an exercise (so far as I know). Before I show it to you, let me explain how I came to realize this could be done.
Firstly, I seen this video of Scott Sonnen doing this exercise:
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When I seen this, I realized that if you hold the middle portion, this would be a good static abdominal exercise. Then I thought to myself that if you hold this middle position and extend your arms straight out, it would be like doing a bodyweight Pallof Press. A pallof press is an exercise that trains rotational stability.
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Here's me doing an easy version of this.
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I can't extend my arms because its too hard. In the video I am on my knees like a easy side plank. I envision that someday I will be able to hold this position on my feet (like a regular side plank) and then extend my arms out for reps or time.
So, that is my challenge to you! Have your feet planted on the ground like a side plank, and then extend the arms so that the ring stays level at the chest. Can you do it?