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.
While there are a number of primary muscles involved in squatting, there are also several secondary muscles that help make this exercise possible. The muscles on the inside and outside of your hips and thighs, your adductors and abductors, work to ensure your knees track over your feet and do not swing inward or outward.