Proprioception is the sense of the relative position of neighbouring parts of the body. Peoples abilities in this area vary and tyoicaly it is less with kids. Sometimes you tell a student that they need to move or position themselves a certain way and they may think or say "I thought I was doing that". Other times you me see them look down at their feet or look at their legs or arms to visualy confirm the position. Easy enough for static positions. Playing with the Iphone 6 Slo motion feature it seemed like a useful tool for someone to review positioning during all manner of techniques, even jumpingtechniques to determine what needs correction. anyone using this?