The ambulatory foot movement inside {HEAD ~ the shoe} puts pressure on {TAIL ~ the fluid} and makes it flow from one chamber area to another 
The ambulatory foot movement inside { HEAD ~ the shoe } puts pressure on { TAIL ~ the fluid } and makes it flow from one chamber area to another
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH