I don't teach the standing run because it is a great way to injure knees. Most people do not keep enough tension on & as a result they have to rely on quad strength - which most do not possess.

I do teach the standing position using the handlebars as a balance point only, not a support. I'm amazed at how many people lean on the handlebars -- until I tell them that standing without leaning strengthens their core. You should see the people pop up, stand & smile!