Articletemplate. Because the human body is stronger at some positions than at others, we are limited as to the amount of weight we can use in a certain movement.
For instance, you may be able to do a quarter squat with 600 lbs, but you may be able to only full squat 400 pounds. We all know through practical experience that while doing a simple curl, at the start of the movement, is very hard, whereas at the finish it is somewhat easier because of changing leverage. This problem was first addressed around 1900 by Max Herz. His solution was the oblong cam, which he patented. Years later, the Nautilus line of exercise equipment tried to solve this age-old problem, -in my opinion unsuccessfully.
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