Optical motion analysis systems are typically used to perform kinematic analysis of human movement. However these systems are primarily laboratory-based, expensive, have a limited calibration volume, and often require considerable post processing time. Such an approach to motion analysis is therefore often impractical for analysis of athletes during actual training and performance environments. A strong need exists to develop methods that provide meaningful information about athletic performance in the field without unnecessarily encumbering the athlete or constraining the natural environment. Such information should be rapidly available to the coach and athletes and presented in a form that is practically relevant and easy to interpret. At present the validity and reliability of such methods for evaluating running performance is unknown.
This is the mainstay of our work in sports technology and recently has become sought after in the health industry where post operative exercise compliance and daily free living monitoring is desired | 
