Adapts itself to the way the body moves instead of forcing users to adapt to the machine. During any exercise, an individual's strength varies at different points. Other machines don't address this strength curve -- instead, the weight remains constant from beginning to end. This can limit muscle recruitment and overall performance. Enter Optimal Strength Curve Technology. Driven by our four-bar linkage system, cam design, or a combination of both, this unique technology dynamically matches the body's potential increases and decreases in strength. Users get immediate, smooth resistance and proper muscle loading through the complete range of motion. Introducing our patent-pending 5 lb increment weight stack. It accommodates slight strength gains and eliminates friction and maintenance of add-=on weights. Proprietary pin design limits pilferage and misuse liability. Undated exercise placards with EVO® exercise descriptions, integrated parts schematic inside shroud simplifies service. Updated sleek, fully-enclosed weight shields that protect users. Marine-grade, contoured upholstery for added comfort, longevity and improved aesthetic. Enlarged bottle holder and towel knob for convenience.