The smith machine is a weight machine used for weight training it consists of a barbell that is fixed within steel rails allowing only vertical or near vertical movement.
Smith machine squat rack bar weight.
The user may move the barbell up and down but cannot remove it from the machine.
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A power rack also known as a squat rack contains a rack that the free bar is placed upon.
Both smith machines and power racks come with several attachments.
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The reason is this piece only allows movement in a fixed plane of motion.
A smith machine holds a barbell in a fixed vertical path.
Some smith machines have the barbell counterbalanced the machine can be used for a wide variety of exercises though it is most commonly used to perform smith machine squats.
How does a smith machine differ from a power rack.
Because an olympic bar is attatched to the machine does not make this a free weight piece.
My biggest problem with the smith machine is that people are convinced they are still doing free weight movements when they perform exercises on the smith machine.
Many include built in chin up bars weight plate storage dip stands pull down cable attachments and others.
Each piece of equipment adds a level of stability and safety versus performing free weight exercises without a machine.