The marks that guide the trajectory of segments are classified as tracking, and are arranged in fours on the rectangular base (cluster). The markers were placed on the base of the sacrum, on the middle third of the thigh and middle third of the leg. Anatomical markers were fixed with double-faced adhesive tape and reinforced with surgical tape, while tracking markers were coupled to the body segments with elastic bands and Velcro. Markers were colored by the same rater on all the volunteers, in order to preserve the reliability of the marking.