The adjustable harness 1228 may include, among other components, three pressure sensors 1226A-C, each attached to the adjustable harness 1228. At each point on the adjustable harness 1228 at which a pressure sensor 1226 is attached, an adjustable strap 1230 is attached to the adjustable harness 1228. The adjustable strap 1230 may be an adjustable mechanism as described above with reference to