From the displayed weightlifting graphics interchange format provided, the muscles involved with the isotonic contractions are: Biceps femoris, Semimembranosus, Rectus femoris, Gastrocnemius, and Vastus lateralis. Moreover, the muscles engaged in isometric contractions are: Pectoralis major, Latissimus dorsi, Deltoid, Flexor carpi ulnaris, and Subscapularis.