 One piece of technology that allows this decrease in rehabilitation time is the use of a body weight supported treadmill to allow a much quicker return to running, within the limitations of a protocol. One such example is the AlterG, Anti-Gravity treadmill. This treadmill allows a patient to run with as little as 20 of their body weight using an air pressure system for unweighting. This type of unweighting allows for safe and normal gait mechanics, in a pain free system. This type of treadmill also allows a clinician to adjust and monitor changes and improvements as a patient progresses through a treatment.8 