Supplementary Figure S2. Distribution of raw sEMG observations across attachment conditions and cadence-defined analytical intervals. Raw observed sEMG amplitude (%MVIC) is shown for the cadence-defined lifting and lowering analytical intervals across straight bar (SB), wide V-shaped handle (WVS), cambered bar (CB), and rope (RP). These interval labels do not represent mechanically synchronized phase boundaries. Violin plots show distributions, boxplots show medians and interquartile ranges, and diamonds indicate means. Panels are ordered as latissimus dorsi, middle trapezius, posterior deltoid, biceps brachii, and triceps brachii. Pink denotes lifting; light blue denotes lowering.