Almost physically impossible if you have a closed-chain. Let me explain - whenever your feet are "grounded" or "anchored" to the ground (they touch the ground basically), naturally, even if you try really hard, most of the movements are being started through the legs and the big buttocks muscles.
When you are in open-chain position (feet not touching the floor), like sitting on your butt legs in the air and you start doing trunk rotation, your butt is the anchor so the muscles initiating the movements will be the core muscles (muscles all around your spine).
If you were hand-standing (closed chain position as hands are anchored on the ground) and wanted to do a body twist while hand-standing, the movement would be initiated from around the shoulders muscles.
A movement is always initiated by the muscles above the "anchor" point. If your butt is the anchor, then your core will initiate. If you legs are the "anchor", then your legs do initiate, etc...
Does that makes sense?
Cheers,
Marc
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Marc Dagenais, MHK, CSCS
http://www.softballperformance.com
Marc Dagenais is a softball peak performance coach that helps players be more confident, mentally tougher, hit with more power, run faster, throw harder, and be more dominant on the field. He also helps coaches win more games and get more out of their team.
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