A wearable device (2, 102, 202, 302), the wearable device (2, 102, 202, 302) comprising: a controller comprising a processor; an inflatable body (4, 104, 204, 304) configured to be mounted to a torso of a user; a first sensing device (7a, 107a, 207a, 307a), wherein the first sensing device (7a, 107a, 207a, 307a) comprises a first sensor (8a, 108a, 208a, 308a) and a first actuator (12a, 112a, 212a, 312a) coupling the first sensor (8a, 108a, 208a, 308a) to the inflatable body (4, 104, 204, 304); and a memory (18, 118, 218, 318) storing computer-readable instructions that, when executed by the processor, cause the wearable device (2, 102, 202, 302) to: inflate the inflatable body (4, 104, 204, 304) from a first state of the inflatable body (4, 104, 204, 304) to a second state of the inflatable body (4, 104, 204, 304); actuate the first actuator (12a, 112a, 212a, 312a) from a first state of the first actuator (12a, 112a, 212a, 312a) to a second state of the first actuator (12a, 112a, 212a, 312a), wherein actuating the first actuator (12a, 112a, 212a, 312a) from the first state of the first actuator (12a, 112a, 212a, 312a) to the second state of the first actuator (12a, 112a, 212a, 312a) reduces a volume of a first air gap between the torso and the first sensor (8a, 108a, 208a, 308a); and while the inflatable body (4, 104, 204, 304) is in the second state of the inflatable body (4, 104, 204, 304) and the first actuator (12a, 112a, 212a, 312a) is in the second state of the first actuator (12a, 112a, 212a, 312a), receive a first signal from the first sensor (8a, 108a, 208a, 308a). a controller comprising a processor; an inflatable body (4, 104, 204, 304) configured to be mounted to a torso of a user; a first sensing device (7a, 107a, 207a, 307a), wherein the first sensing device (7a, 107a, 207a, 307a) comprises a first sensor (8a, 108a, 208a, 308a) and a first actuator (12a, 112a, 212a, 312a) coupling the first sensor (8a, 108a, 208a, 308a) to the inflatable body (4, 104, 204, 304); and a memory (18, 118, 218, 318) storing computer-readable instructions that, when executed by the processor, cause the wearable device (2, 102, 202, 302) to: inflate the inflatable body (4, 104, 204, 304) from a first state of the inflatable body (4, 104, 204, 304) to a second state of the inflatable body (4, 104, 204, 304); actuate the first actuator (12a, 112a, 212a, 312a) from a first state of the first actuator (12a, 112a, 212a, 312a) to a second state of the first actuator (12a, 112a, 212a, 312a), wherein actuating the first actuator (12a, 112a, 212a, 312a) from the first state of the first actuator (12a, 112a, 212a, 312a) to the second state of the first actuator (12a, 112a, 212a, 312a) reduces a volume of a first air gap between the torso and the first sensor (8a, 108a, 208a, 308a); and while the inflatable body (4, 104, 204, 304) is in the second state of the inflatable body (4, 104, 204, 304) and the first actuator (12a, 112a, 212a, 312a) is in the second state of the first actuator (12a, 112a, 212a, 312a), receive a first signal from the first sensor (8a, 108a, 208a, 308a). inflate the inflatable body (4, 104, 204, 304) from a first state of the inflatable body (4, 104, 204, 304) to a second state of the inflatable body (4, 104, 204, 304); actuate the first actuator (12a, 112a, 212a, 312a) from a first state of the first actuator (12a, 112a, 212a, 312a) to a second state of the first actuator (12a, 112a, 212a, 312a), wherein actuating the first actuator (12a, 112a, 212a, 312a) from the first state of the first actuator (12a, 112a, 212a, 312a) to the second state of the first actuator (12a, 112a, 212a, 312a) reduces a volume of a first air gap between the torso and the first sensor (8a, 108a, 208a, 308a); and while the inflatable body (4, 104, 204, 304) is in the second state of the inflatable body (4, 104, 204, 304) and the first actuator (12a, 112a, 212a, 312a) is in the second state of the first actuator (12a, 112a, 212a, 312a), receive a first signal from the first sensor (8a, 108a, 208a, 308a).