[yardie]

Because descent is usually trickier than ascent. If you've ever climbed down a ladder missing a rung there is that brief moment of free fall where you assume where you're going to land. But if you're on a rain slick, moss covered trail a controlled descent can be difficult even under ideal circumstances.

[arethuza]

People also have tendency not to want to backtrack uphill again so will continue downhill way past the point where it stops being a good idea.