I get activity envy, full stop. If I'm walking to the shop or sat in my car and see someone running then I want to get my running kit on. If I see someone on a road bike then I want to be on the roadie, if I see someone on a mud covered MTB then I want to be on my MTB.

I can also get the envy when I'm doing something! The other weekend I was hiking on one of the mountains in the Lakes (Red Screes) on a beautiful, clear November day when a couple of fell runners bounded past and I wanted to be running instead (I'm not fit or daft enough to do proper mountain fell running though).