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