FWIW, one more data point on this: I haven't tried using Glass while working out. I always leave it at home when I go to the gym, mostly because I just assumed

FWIW, one more data point on this: I haven't tried using Glass while working out. I always leave it at home when I go to the gym, mostly because I just assumed that getting my sweat all over it isn't great for its longevity. It doesn't feel very rugged (but I've accidentally sat on it quite a few times with no apparent harm).