You mean the human Applejack with a magic stone that grants super strength? And even without taking the Geode of Strength into account, lifting involves not only pectoral muscles but also dorsal, abdominal, and leg muscles. If you tried to snap ropes binding your arms, you could only use your pectorals, deltoids, and trapezii, not your abs or quadruceps. Same goes for your legs; if you wanted to break ropes binding your ankles and thighs, you'd need some superhumanly strong hip muscles to spread your legs and counteract the tensile resistance being exerted all the way up and down.In short, trying to break free of bindings around your limbs is a lot harder than lifting a heavy object because you can't use nearly as many muscles.