Originally Posted by halfbiked
And what is this secret?
Pedal slowly.
Make sure your heart rate does not rise, and breathing rate does not increase. If your heart rate starts to rise or your breathing rate starts to increase ... pedal slower.
You
can stay upright at about 4-5 km/h.
Once you've gotten better at going really, really, really slowly ... then you can start working on picking up your speed a bit.
At least that's what worked for me!