Exercise Treadmill

A treadmill comprising:

• a platform;
• a belt located around the platform;
• means for rotating the belt around the platform to create an endless surface on which a user exercises, wherein the means for rotation includes a varying resistance device for dynamically adjusting a resistance of rotation of the belt, wherein the rotation of the belt is at least partially induced by the user exercising;
• and
• a computer system configured to operate the varying resistance device to dynamically adjust the resistance of rotation of the belt based on a current speed of the belt and a target speed of the user while exercising.

A treadmill comprising:

• a platform, wherein a front of the treadmill includes no structure which could obstruct the arm or leg motion of the user while the user is exercising on a usable area of a surface of the platform;
• a belt located around the platform;
• means for rotating the belt around the platform to create an endless surface on which a user exercises;
• at least one side hand rail extending along at least approximately all of a side of a usable area of the platform;
• a set of lengthwise sensors mounted to at least one side hand rail, wherein the set of lengthwise sensor are configured to acquire data corresponding to a lengthwise position of the user along a length of a usable surface of the platform;
• and
• a computer system configured to determine the lengthwise position of the user on the platform using the data acquired by the set of lengthwise sensors and perform at least one action based on the determined lengthwise position of the user on the platform.