Get your feet wet and walk on a piece of paper. If you can only see the print of your heel and the ball of your foot, your feet probably over-supinate. Remember, however, that this is not a common condition. The supinator's feet are more rigid and cannot absorb shock as well as overpronated feet, so the supinator is more prone to ankle sprains, stress fractures, and pain on the outside of the shin and knee. There are straight, semi-curved, and curved lasts.
Lasts are average shapes made from surveys of many feet.
To determine the shape of your foot, stand on a sheet of paper and trace the outline of each foot. If the line runs through your first two toes you have a straight foot. If it runs through your middle toe you have a semi-curved foot. If it runs through your last two toes you have a curved foot. It' s helpful if you send an outline of your foot back to American Running Association with your questionnaire so we can see your foot shape.