Machines stabilize the movement for you so all of your effort goes to training the target muscle. Free weights require you to stabilize the movement yourself,. Weba set of free weights can be found at just about every gym, and with good reason!

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Webidk if it’s every planet fitness but the lack of free weights is a major issue i’ve seen at my local ones. You literally can’t squat, deadlift, or bench press properly at planet fitness.