[Scott Johnston]

It depends…..Stair machines like the Stairmaster (escalator type) are great aerobic base training, and especially if you run hills a lot, the stairs will transfer over well to uphill running.  They probably won’t make you faster on the flats though.  But they are a great way to add non-impact foot-borne aerobic training volume.   More aerobic base training volume in a modality this close to running will help improve aerobic capacity.  Don’t expect it to make you much faster as a runner except uphill.

Scott