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.