Yoga: Yes, it's for people with hyperhidrosis too!
I had an epiphany during a recent yoga class. No, I didn't attain nirvana or a state of total consciousness. And maybe epiphany is too strong a word...here's what happened: I saw an attractive young woman with a happy aura doing yoga in her socks. The teacher suggested that she remove her socks, and she said "No, I need to keep them on...my feet slip around too much." Her statement was matter-of-fact and absent of any shame or self-consciousness. The teacher said something along the lines of "yes, that happens a lot."
After the class, I spoke with the sweaty-footed yogini. We swapped tips on how to prevent skids on the mat. I use a little towel at the top of my mat, and I have one mat in particular that seems to absorb sweat while remaining sticky. There are also yoga towels that have a rubber backing that clings to the mat.
I had avoided yoga for so long because I didn't want to be embarassed by my sweaty feet, but if anything, yoga has improved my hyperhidrosis.