A braking system for a treadmill having a tread that rotates around a front axle and a rear axle and a side rail on each side of the tread that does not move includes a brake configured to apply a braking force to one of the front axle and the rear axle, a controller in communication with the brake, and a weight sensor under each side rail configured to detect a load indicating that a user is standing on the side rails, each weight sensor in communication with the controller. The controller is configured to, when the tread is moving, engage the brake when a first signal is received from each weight sensor contemporaneously that a load is detected and disengage the brake when a second signal is received from each weight sensor contemporaneously that the load is removed.

A respiratory device of negative pressure type comprising a shell fastened to the user's chest and/or abdomen with minimal dead space, one or more vacuum and compressed air chambers attached to the shell; vacuum generating and compressed air generating sources connected to the vacuum and compressed air chambers respectively, one or more openings on the shell to allow exchange of the air enclosed between shell and user's body, with the vacuum and compressed air chambers; a valve shuttling between the vacuum and compressed air chambers. By having low dead space, pre-generated vacuum and compressed air close to the user, and the use of fast acting valves in some embodiments, the power requirement, weight, and size are reduced, making the device low cost and portable. In some embodiments, the vacuum and compressed air generating sources can be mounted on the shell itself, making the device ambulatory.

A lighting system for a treadmill is described. The treadmill includes a tread that rotates around a front axle and a rear axle. The tread defines a cavity and comprises slats each having a tread surface and an underside. Each slat is attached at longitudinal ends to a respective belt that rotates on bearings around the front axle and the rear axle. The slats are configured with a space between adjacent slats. The lighting system comprises lights located in the cavity. The lights are configured to emit light away from the cavity through the space between the adjacent slats along at least a portion of the treadmill. A controller is in communication with the lights and is configured to control the lights.

A locking system for a treadmill includes a locking mechanism having a locked configuration that prevents the tread from rotating in a front-to-rear direction and an unlocked configuration which allows the tread to rotate in the front-to-rear direction. A presence sensor and a weight sensor are each configured to detect the user on the treadmill, and a display is configured to receive an inputted code indicating the user is on the treadmill. The controller is configured to move the locking mechanism to the unlocked configuration in response to the controller receiving signals from at least two of the presence sensor, the weight sensor and the display indicating that the user is on the treadmill, and move the locking mechanism to the locked configuration in response to the controller receiving signals from both of the presence sensor and the weight sensor indicating the user is not on the treadmill.

A lighting system for a treadmill is described. The treadmill includes a tread that rotates around a front axle and a rear axle. The tread defines a cavity and comprises slats each having a tread surface and an underside. Each slat is attached at longitudinal ends to a respective belt that rotates on bearings around the front axle and the rear axle. The slats are configured with a space between adjacent slats. The lighting system comprises lights located in the cavity. The lights are configured to emit light away from the cavity through the space between the adjacent slats along at least a portion of the treadmill. A controller is in communication with the lights and is configured to control the lights.

A locking system for a treadmill includes a locking mechanism having a locked configuration that prevents the tread from rotating in a front-to-rear direction and an unlocked configuration which allows the tread to rotate in the front-to-rear direction. A presence sensor and a weight sensor are each configured to detect the user on the treadmill, and a display is configured to receive an inputted code indicating the user is on the treadmill. The controller is configured to move the locking mechanism to the unlocked configuration in response to the controller receiving signals from at least two of the presence sensor, the weight sensor and the display indicating that the user is on the treadmill, and move the locking mechanism to the locked configuration in response to the controller receiving signals from both of the presence sensor and the weight sensor indicating the user is not on the treadmill.

A braking system for a treadmill having a tread that rotates around a front axle and a rear axle and a side rail on each side of the tread that does not move includes a brake configured to apply a braking force to one of the front axle and the rear axle, a controller in communication with the brake, and a weight sensor under each side rail configured to detect a load indicating that a user is standing on the side rails, each weight sensor in communication with the controller. The controller is configured to, when the tread is moving, engage the brake when a first signal is received from each weight sensor contemporaneously that a load is detected and disengage the brake when a second signal is received from each weight sensor contemporaneously that the load is removed.

A pacing system for pacing an activity receives a desired pace that includes a timing interval and generates a first pace signal based on the desired pace and corresponding to the timing interval. The system receives feedback on an actual pace of the activity and determines if the actual pace is different than the desired pace. When the actual pace is different, the system generates a second pace signal having a timing that is different than the timing interval. When the actual pace is not different, the system generates the second pace signal in accordance with the timing interval.

An exercise treadmill is disclosed. The treadmill can include one or more sensors to acquire input data. A computer system can trigger one or more actions based on the input data. The input data can correspond to a lengthwise position of the user along a length of a usable surface of the platform and/or a lateral position of the user on the belt. The action(s) can include providing feedback to the user and/or adjusting rotation of the belt and/or a resistance of rotation of the belt. The adjustment can be performed in response to input from a user control requesting the adjustment.

A head mounted virtual reality object synchronized physical training system includes a virtual reality device, a physical training equipment, and a physiological signal sensor. The virtual reality device includes a display operable to display a virtual reality object according to an operation of the user. The virtual reality device is detachably mounted to a head of the user and provides the user with a function of interaction. The physical training equipment includes an exercise data sensor operable to detect exercise data that the user operates the physical training equipment. The physiological signal sensor is operable to detect a human body physiological signal and a human body movement signal of the user. The physical training equipment and the physiological signal sensor have a function of synchronization with the virtual reality object displayed on the virtual reality device.