Does anyone have suggestions for places to run outside when it's slippery? I normally do the Vitkov path, the path from Karlin to Troja, Stromovka, etc. but this weather has turned a lot of these paths into ice rinks. Need to do a 15k training run this weekend - anyone have suggestions for somewhere with better footing where I can get a long run in? (I do belong to a gym but there's no way I'm running 15k on a treadmill). Thanks!