The lat pulldown machine is a widely used resistance training device desingned to strenghten upper-body back muscles, particulary the latissumus dorsi, trapezius, rhomboids, and biceps brachii. Despite its widespread use in both gym and rehabilititation settings, most existing designs are developed empiriically, without rigorous consideration of structural stress distribution, material efficiency, or geometric optimization, This has led to machines that are often overweight structurally over-desingned, and potentially susceptible to machenical failure under repetitive loading conditions.

The tehis presents a comprehensive strructural analysis and geometric optimization of a weight-stack lat pulldown machine using ANSYS Workbench finite element analysis (FEA) software and SolidWorks for 3D modelling and mass property evaluation.