This is virtually what the highly advanced AlterG M300 Treadmill will do for individuals.  The treadmill literally decreases the gravity level up to 80% around your lower body which makes it much easier for more injured people to be able to still keep up good health and exercise while trying to heal.  The AlterG M300 can support the weight between 90 and 400 lbs, which means an even great amount of people can take advantage of this machine.  Where will you find them?  Most likely at a physical therapy clinics, physical training facilities, and in the homes of the wealthiest.  This is because one treadmill costs a whopping $24,500 dollars!  I guess this seems reasonable since we have accomplished an extremely difficult breakthrough in technology.

How it works?  You simply step into the AlterG and raise the enclosure to waist level, and the air will surround the lower body.  Pretty standard controls as compared to a traditional treadmill, adjustable speed between 0-18 MPH and incline levels up to 15%.  So, if you have some loose thousands lying around and are in the market for something that really is beneficial to joint and injury health, then check out one of these.  They really do look amazing.

References

1. gizmag.com

2. Treadmill