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How to use gym equipment
Look for instructions.
Most machines have a short set of instructions and illustration affixed to them.
Find the adjustments.
The machines' seats and benches adjust to the height of the user, and you can adjust moving parts to accommodate your leg or arm length. Adjust the machine so your joints line up with the pivot points of the machines, your legs (if sitting) are flat on the floor, and the pads rest comfortably against your limbs.