The unloaded weight of a bar on a Smith machine can vary, typically ranging from 15 to 75 pounds. This unloaded weight, often called the counterbalance, is a crucial factor to consider when calculating the total resistance during exercises. For example, if a lifter adds 100 pounds to a bar with a 30-pound counterbalance, the total lifted weight is 130 pounds.
Understanding this baseline resistance is essential for accurate tracking of strength progress and designing effective workout programs. Historically, Smith machines aimed to provide a safer alternative to free weight barbell training. Knowing the starting weight allows lifters to compare progress on Smith machine exercises with free weight exercises, facilitating a more informed training approach. The counterbalance system also reduces the perceived weight for beginners, potentially making the transition to weight training more manageable.