Kat, I did the same thing at lunch - it is raw and cold here, overcast with a little rain - I just thought to myself that one more rest day will not hurt me. I did a half hour of core exercizes this morning and that's that. I'll run tomorrow.

I think it's okay to do the bike on the trainer. Or go for a walk. Or do some pushups, or carry lots of laundry up and down the stairs, or put some music on and dance!