I felt the same way this morning but kicked myself out the door and onto the bike and in no time, I was feeling great again. I too had a great ride in and took the longer 20km route. It still isn't "perfect", there is still left-over sand from the winter but hopefully, that will be cleared up soon.

I was considering riding in shorts this morning but the temperature was 5C/41F, just a bit too cool but maybe if I wore long wool socks instead of my summer short socks, that might be sufficient to ward off the cool until my legs have warmed, I'll consider that tomorrow morning which is forecast to be similar in temperature.