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Smith machine
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== 3D Smith machine == A conventional Smith machine has one [[degrees of freedom (mechanics)|degree of freedom]] β the bar can move up and down in a straight line along a vertical track. (Rolling the bar is also typically used to activate the safety locks.) Some variant designs allow an additional degree of freedom β forward and back β while still keeping the bar from rotating or moving side to side. These machines are sometimes called "3D Smith machines" or "Jones Smith machines". A few designs, such as Shermworks' "Free Spotter" or TuffStuff's "XPT Training System", permit almost all degrees of freedom while still incorporating user-activated safety catches (as opposed to the passive, pre-set safeties of a [[power rack]]).
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