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Originally Posted by Eric3237
LOL, push against an immovable object and you are applying a muscular force but the nothing moves. The muscle contracts but it's length remains constant. I should probably say "appying muscular effort" without any joint movement to be more clear.
The biggest benefit right off the bat is rehabilitation.
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perfect example: Wall sits, just lean on the wall with your back facing it, and act like you're sitting in an invisible chair.