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.
The hip extensors work in a vertical jump to extend the hip after the initial squat. These muscles include the gluteus maximus and the hamstrings. Of these muscles, the gluteus maximus has the most impact on the jump. The hamstrings are two-joint muscles. In addition to extending the hip, they work to bend the knee.