Smith machines are the safest way for serious weight lifters to work out at home. Any experienced strength coach will tell you that working to failure is fundamental to building significant muscle mass.
Of course pushing each set to failure in an unsupervised environment can be dangerous to say the least. Smith machines are so popular because they combine the feel of free weights with the safety of traditional resistance machines.
Smith machines tend to be quite expensive, more so than multi gyms aimed at the general public, Why? Simply because they are designed for experienced lifters who can move a lot of weight! That requires quality construction from a high gauge steel.
Remember also that you still have to buy the weight plates separately. It all adds up and you should be sure that you are serious enough about your training to justify the cost of a smith machine
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