Is the ice on the roads interfering with your running regimen? If life gives you ice, ice skate. Seriously, ice skating is a great way to mix up your work out. Plus it is way less stressful on your joints than running. Skating challenges your stamina and balance. Because you are riding that thin little edge your core is put to the test to keep you upright. Plus it is a bone building exercise too.
If you are going to try skating, rent skates that are tight fitting. They should be tighter than your street shoes. Also, dress in layers to keep warm and cushion your falls. Most rinks offer classes and you can learn basic skills like skating backwards and how to fall correctly.
The big bonus to skating is that skating at a moderate pace burns between 430 - 500 calories (depending on weight). Plus it is fun for the whole family. So head to the rink and get skating.