Knickerbocker's theory does not explain why the first firm in an oligopoly decides to undertake FDI rather than to export or license. (Hills, 2008) also suggested that the imitative theory does not address the issue of whether FDI is more efficient than exporting or licensing for expanding abroad.
Isometrically, the lower back, the upper back, the abdominals, the trunk muscles, the costal muscles, and the shoulders and arms are all essential to the exercise and thus are trained when squatting with the proper form.
Two variations of the movement -- the back squat, which uses a barbell, and the hack squat, which requires a dedicated hack squat machine -- target the quadriceps muscles on the front of your thigh. However, back squats also work many other muscles of the hips and core, making them more of a full body exercise.o perform a hack squat, step into the machine and position your back against the back rest, with your shoulders under the padded shoulder supports. Position your feet on the foot plate about shoulder-width apart.