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Comparison of the muscular electrical activity and hip–knee joint amplitude during bent-knee sit-up movement and abdominal exercises using a five-minute shaper device: a case study on an unconditioned subject. JPES [Internet]. 2021 Dec. 30 [cited 2026 Nov. 6];21(6):3577-85. Available from: https://www.efsupit.ro/index.php/jpes/article/view/1876