An exercise device , comprising: a treadmill comprising: a treadmill frame ; a running belt coupled to a treadmill frame ; a motor coupled to the running belt ; an offloading system coupled to the treadmill, the offloading system comprising: an air chamber at least partially surrounding the running belt ; a user seal coupled to the air chamber and configured to selectively receive at least a portion of a user so that, in an operating condition, at least a portion of a user extends partially into the air chamber and to seal the air chamber around a user; and a pump operable to selectively inflate the air chamber ; a sensor configured to provide a measurement indicative of a pressure in the air chamber , and a controller coupled to the motor and the pump and configured to: concurrently control the motor and the pump ; characterized in that the controller is further configured to: determine that the measurement is indicative of a loss of pressure in the air chamber by determining that the pressure in the air chamber is outside a predefined acceptable range of pressures; and control the motor to stop movement of the running belt in response to a determination that the measurement is indicative of the loss of pressure in the air chamber . a treadmill comprising: a treadmill frame ; a running belt coupled to a treadmill frame ; a motor coupled to the running belt ; a treadmill frame ; a running belt coupled to a treadmill frame ; a motor coupled to the running belt ; an offloading system coupled to the treadmill, the offloading system comprising: an air chamber at least partially surrounding the running belt ; a user seal coupled to the air chamber and configured to selectively receive at least a portion of a user so that, in an operating condition, at least a portion of a user extends partially into the air chamber and to seal the air chamber around a user; and a pump operable to selectively inflate the air chamber ; an air chamber at least partially surrounding the running belt ; a user seal coupled to the air chamber and configured to selectively receive at least a portion of a user so that, in an operating condition, at least a portion of a user extends partially into the air chamber and to seal the air chamber around a user; and a pump operable to selectively inflate the air chamber ; a sensor configured to provide a measurement indicative of a pressure in the air chamber , and a controller coupled to the motor and the pump and configured to: concurrently control the motor and the pump ; characterized in that the controller is further configured to: determine that the measurement is indicative of a loss of pressure in the air chamber by determining that the pressure in the air chamber is outside a predefined acceptable range of pressures; and control the motor to stop movement of the running belt in response to a determination that the measurement is indicative of the loss of pressure in the air chamber . concurrently control the motor and the pump ; characterized in that the controller is further configured to: determine that the measurement is indicative of a loss of pressure in the air chamber by determining that the pressure in the air chamber is outside a predefined acceptable range of pressures; and control the motor to stop movement of the running belt in response to a determination that the measurement is indicative of the loss of pressure in the air chamber . determine that the measurement is indicative of a loss of pressure in the air chamber by determining that the pressure in the air chamber is outside a predefined acceptable range of pressures; and control the motor to stop movement of the running belt in response to a determination that the measurement is indicative of the loss of pressure in the air chamber . <EOS>