All participants underwent a familiarization session one week prior to the data collection session, during which they were accustomed to the experimental set-up during trials of the proper exercise technique. Before data collection, each participant warmed up with 5 min of cycling and static stretching of the suspension exercise prime moving muscles (including upper trapezius, pectoralis, biceps, triceps, abdominals, back extensors, hip flexors and extensors, quadriceps, and hamstring muscles). sEMG data were collected during two 5-s maximal voluntary isometric con-traction (MVIC) trials against manual resistance for each muscle of interest with a 2-min between-trial rest period. The average RMS value during a middle 3-s window of each trial was chosen as the representative MVIC value for data normalization and further analysis. For the RA, participants laid with their hips and knees flexed to 90◦ and their trunk maximally flexed (i.e., curl-up) against bilateral shoulder resistance manually provided by the experimenter pushing the trunk into extension. For the EO and IO/TrA, participants exerted additional resisted trunk rotation to the right and left, respectively. For the LMF, participants laid prone with their lower limbs supported and restrained on a plinth and their hands clasped behind their heads. They then performed maximal trunk extension to maintain the unsupported upper body in a horizontal position against manual resistance applied at the posterior shoulders bilaterally.