Schwinn Airdyne AD4 - Manual (Page 8)

11. 11. 11. Apply Apply Apply Skid Skid Skid Resistance Resistance Resistance Pads Pads Pads
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Final Final Final Inspection Inspection Inspection
Inspect your machine to ensure that all fasteners are tight and components are properly assembled.
Do not use until the machine has been fully assembled and inspected for correct performance in accordance with the Owner’s Manual.