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The best shoes for weightlifting are flat ones that don't lift the heel. You want to train barefoot or in shoes like skate shoes. When the heel is lifted higher than the toe you are changing your stance in a way that shifts your weight forward. This makes the exercise feel easier because you can lift more weight with this weight shift. However it places more stress on the knees, as well as partially removes your glutes and hamstrings from the exercise. Basically you're working the quadriceps primarily when the exercises should be hitting the quads, glutes, and hams as a whole.