[fatnoah]

I had a similar experience, but with cross-country skiing. I was an avid skier from age 2 to 22. I raced in high school, spent every weekend out skiing (skating and traditional), had no problems on any trail, no matter how steep or difficult, etc.

In college, I took up downhill skiing. Twenty years later, I tried cross-country skiing again and could barely stay upright! I went in with full confidence and ended up shuffling around like a zombie on ice.