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Biomechanics or Kinesiology is the study of human movement including the interaction between the human and equipment. Primarily these studies are broken down into two broad areas: Kinetics (the study of forces acting on the body) and kinematics (the study of movements of the body). Biomechanics uses technique including mathematical modelling, computer simulations and measurements to enhance performance and reduce injury. It can be applied to a wide variety of activities in order to identify optimal movement patterns to improve activity-specific techniques, analyze muscular recruitment and loading to determine the safest method of performing a particular task/movement, assist in developing proper movement habits which can be maintained long term (maximising performance and minimising injury risk) and analyze equipment. Biomechanical testing can take place in the lab or in the field. Testing methodology is determined based on the problem that needs to be answered and in consultation with an expert. Some typical biomechanical testing methods are : 3D analysis is appropriate for activities involving complex body movements and were very accurate, detailed information is needed. Typically 3 D analysis is done using high speed 3 D motion analysis system in a lab, force plate analysis is typically used for walking, running and landing activities and used in conjunction with 3 D motion analysis system, useful for determining impact, breaking and propulsive forces; calculating joint kinetics; and, weight transfer in dynamic activities, high speed video analysis is done with the help of high speed cameras, such as photron, that can operate upto 1000 Hz. It is very useful for qualitative analysis of high speed movements and impacts, EMG is used for measuring muscle activity, often combined with 3D motion analysis and force plate testing. It is only used for higher level analysis and accelerometers, gyroscopes, and lasers are used to determine the technical characteristics of the worker's motion.