Don't sweat it fellas.

[that was for my benefit...I had to do it]
Are you guys heavily stressed during your normal daily activities?
Do you sweat a lot at rest?
Sometimes it can be a sign of excessive nevous system stimulation (sympathetic response).
There are some meds that can reduce it, but they screw with your whole body, not just the sweat glands. Botox works too.
Personally, if it's just during exercise, I wouldn't worry about it.
Lower your daily stress levels and see how that goes (Is that even possible in our world).
Bill