A full body Gait Training Harness for children with disability may be modified for adult use to assist a trainer to teach functions such as walking with a proper gait and crawling. Shoulder straps attached to a torso-encircling belt cross at the trainee's back to eliminate slippage, allowing use on those who have no arms. Leg loops secure the harness to the thighs, rather than through the crotch, for a more secure and comfortable fit. Leg stabilization straps between the leg loops and the shoulders provide tension to encourage development of a proper gait and to prevent crossing of the trainee's legs. Shoulder handles allow a trainer to support a trainee from above without stooping, while a back handle may be used to lift a trainee or support them in a crawling position. Walking extension straps attached to the shoulders allow trainee independence while the trainer retains control.