Method of selecting the foot plane angle in a sliding activity

A method of selecting the angle of a foot plane of a foot in the boot used in a sliding activity comprising of obtaining a balanced sliding position by measuring the coefficient of friction between the boot contact edge/surface and the surface of the sliding activity, and using the coefficient of friction to determine the foot plane angle by a technique selected from the group consisting of:

• a) for a sliding sport in which the sliding contact area is straight in the xy plane or has at least two contact points that are on the xy plane, the angle of foot plane is equal to the inverse tangent of the sum of the coefficient of friction between the contact materials and the foot-plane angle relative to the horizontal, when the length of the conceptual line from the center of gravity to the ball of the foot (where the conceptual bisect lines through the angles formed between the connecting body parts torso, upper leg, lower leg and foot are perpendicular to that line) is at a minimum and when the person is the non-sliding balanced position wearing his/her activity-specific footwear;
• b) for a sliding sport in which the sliding contact area is curved, the angle of the foot-plane is equal to twice the inverse tangent of the sum of the coefficient of friction between the contact materials and the foot-plane angle relative to the horizontal, when the length of the conceptual line from the center of gravity to the ball of the foot (where the conceptual bisect lines through the angles formed between the connecting body parts torso, upper leg, lower leg and foot are perpendicular to that line) is at a minimum and when the person is the non-sliding balanced position wearing his/her activity-specific footwear,
• c) for a sliding sport in which the sliding contact area is straight, a lift, in either under the heel or under the ball of the foot to attain the angle, is generally equal to the distance between the heel and the ball of the foot multiplied by the sum of the coefficient of friction between the contact materials and the foot-plane angle relative to the horizontal, when the length of the conceptual line from the center of gravity to the ball of the foot (where the conceptual bisect lines through the angles formed between the connecting body parts torso, upper leg, lower leg and foot are perpendicular to that line) is at a minimum and when the person is the non-sliding balanced position wearing his/her activity-specific footwear;
• and
• d) for a sliding sport in which the sliding contact area is curved, a lift, in either under the heel or under the ball of the foot to attain the angle, is generally equal to the distance between the heel and the ball of the foot multiplied by the twice the sum of the coefficient of friction between the contact materials and the foot-plane angle relative to the horizontal, when the length of the conceptual line from the center of gravity to the ball of the foot (where the conceptual bisect lines through the angles formed between the connecting body parts torso, upper leg, lower leg and foot are perpendicular to that line) is at a minimum and when the person is the non-sliding balanced position wearing his/her activity-specific footwear.