Paul Bragg said that walking is the king of exercises.
Why is that? Many reasons.
* we walk everyday (or, at least should)
* it's the easiest cardio
* it burns more calories than sitting
* it's the warm-up to running
* it helps with healthy bowel movement
After a big meal, going for a walk feels like such a relief. Again, it burns more calories than sitting, and it helps with healthy bowel movement.
So, remember, if you're too lazy to do anything else, but want just something to burn some calories, go for a walk!