Thanks, LBTC.

It was troubling, and I was glad I had the handrails. It sucks, but I know I went into this at peak fitness (just came back from Ride The Rockies and a few centuries) so I know I won't lose much. But, having your legs just collapse while walking at a blazing 2 mph was a bit discouraging.

I'll try the trainer tonight and see what happens. At least I can't fall off