If you are balancing your heel on the floor and pressing your foot 'against' the pedal you are using it incorrectly. The ergonomic 'correct' position is to turn it 180 degrees and place your foot on top of the pedal and then pressing your food downward. It feels awkward at first but it does take the pressure off of the ball of your heel and spreads the weight distribution throughout your foot. It also keeps your foot pedal from sliding away from you!! Try it :)