Machines
Also known as: Resistance machines
In strength training, machines—also called resistance machines—are devices that apply load through a designed mechanism, commonly a selectorized weight stack, weight plates, pneumatics, or a motor. Many guide the movement along a fixed or partly constrained path and provide a seat, pad, lever, or platform for external support. A cable machine is also a machine, although its handle path is often less constrained.
Before using a machine, adjust the seat, pads, handles, start position, and safety stops so the device fits the intended exercise and your body. Where relevant, align the machine's pivot with the joint being trained and keep contact with the intended supports. The model's geometry determines its path and leverage, so two machines with the same exercise name can feel different across the range of motion. A poor fit is not corrected simply by lowering the pin one slot.
Machines usually reduce balance and stabilization demands compared with free weights. That can make it easier to direct effort toward a target muscle, standardize repetitions, or train hard without grip or balance ending the set first. Free weights may be preferable when the goal is skill or strength in a free-weight lift. Neither category is universally better: a 2023 systematic review and meta-analysis found no direct overall difference in hypertrophy, jump performance, or tested dynamic and isometric strength, while strength gains tended to be specific to the modality used in training.
A guided path is not a guarantee of safety, and a free path is not inherently more functional. The useful choice depends on the goal, body fit, experience, access, and whether the movement can be performed with repeatable control. Keep the same model and settings when comparing performance, because stack labels, lever arms, friction, and starting positions differ. The selected number is a practical setting, not a standardized force shared by all machines.
Alpha Progression Pro can generate an editable plan from the equipment and available weights stored for a gym profile. This equipment-aware planning is available through Alpha Progression Pro; it does not determine whether a particular machine fits an individual user.