I'm not entirely couch-ridden - I've been doing some fairly light strength/stretching stuff every day for months, and biking as main means of transport in a hilly city means my body wasn't taken too much by surprise by the whole concept of exercise. My calves took a while to get used to the new angle of attack though, and I now understand why running is an 'impact' sport and cycling isn't. It feels like harder work somehow.
Anyhow I'm back for more tomorrow....