Alter-G G-Trainer Treadmill for Weightless Running
The "Alter-G G-Trainer," a treadmill which uses a compressed air chamber to lift and reduce the effective weight of its user, has been approved by the FDA for use in rehabilitation for injuries to the lower extremities. The G-Trainer can reduce up to 80% of lower body weight. Prices are probably somewhat extravagant, but unless you keep a rehabilitation chamber in your mad scientist fortress you'll likely only see the trainer when you send henchmen off to be restored to service.
Product Page [Alter-G.com via Oh Gizmo via MedGadget.com]

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So if it's compressed dose that mean if you fart air will go into your anus?
capt. pike I presume?