Selectively adjustable resistance assemblies and methods of use for exercise machines

A method, comprising:

• receiving a first selection from a user through a human machine interface of a treadmill, the treadmill comprising a platform around which a belt rotates, a drive motor configured to control a speed of rotation of the belt, and a linear motor configured to control an incline of the platform, the first selection being at least one of the speed of rotation of the belt and the incline of the platform;
• controlling at least one of the drive motor and the linear motor to selectively change at least one of the speed of rotation of the belt and the incline of the platform based on the first selection;
• receiving a second selection from at least one manual lever, the second selection refining the first selection, wherein the at least one manual lever is a standalone manual control disconnected and separate from another manual control;
• and
• controlling at least one of the drive motor and the linear motor to selectively and respectively refine at least one of the speed of rotation of the belt and the incline of the platform based on the second selection.

A treadmill, comprising:

• a platform around which a belt rotates;
• a drive motor configured to control a speed of rotation of the belt;
• a linear motor configured to control an incline of the platform;
• a human machine interface configured to receive a first selection from a user, the first selection being at least one of the speed of rotation of the belt and the incline of the platform;
• at least one manual lever configured to receive a second selection from the user, the second selection refining the first selection, wherein the at least one manual lever is a standalone manual control disconnected and separate from another manual control;
• a first controller comprising a first processor and a first memory, the first processor configured to execute instructions stored in the first memory to receive the first selection by the user from the human machine interface;
• and
• a second controller in communication with the first controller, the second controller comprising a second processor and a second memory, the second processor configured to execute instructions stored in the second memory to:
• activate the drive motor to selectively change the speed of rotation of the belt based on the first selection received by the first controller, or activate the linear motor to selectively change the incline of the platform based on the first selection received by the first controller;
• and
• activate at least one of the drive motor and the linear motor to selectively refine the first selection based on the second selection received by the at least one manual lever.