Tracking the motion of the points 122 a 122 c may enable a user to reconstruct a model of the motion of the ski in order to give {HEAD ~ feedback} to skiers regarding their weight distribution, velocity, turning technique, timing, stance, {TAIL ~ positioning} and the like 
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Tracking the motion of the points 122 a 122 c may enable a user to reconstruct a model of the motion of the ski in order to give { HEAD ~ feedback } to skiers regarding their weight distribution , velocity , turning technique , timing , stance , { TAIL ~ positioning } and the like
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH