So....since I live in the cold snowy flat land of Wisconsin....I am curious as to what activities you all do in winter when it's too cold/icy to bike? (I know some people still do it-but that won't be me).
I was thinking cross country skiing....or just joining a gym....

what do others do to not let the muscles get out of shape?

(hopefully this isn't in the wrong forum and hopefully this hasn't been posted already (I'm at work and can't browse))