1. Yes. The point of the exercise is to get your entire body involved. While it might not seem as difficult for your lower body, you are working harder by engaging multiple large muscle groups, thus creating more of a metabolic demand.
2. You could do the push-ups explosively, to the point where your hands are almost leaving the ground. Have you tried them with db's? I think you'll find that it does engage your chest more because with your hands slightly elevated, you can go deeper, or in other words, you get a bigger range of motion.
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Hunter
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