It all counts
I'll parrot what others have said about walking if its that close.
I went from an active job (roughly 12-15,000 steps per day) to a sedentary job - (maybe 3000 steps) - all other things being equal , nutrition, cycling , etc. i gained 30 pounds and am fighting like heck to get it back down.
Base activity level is very important even if we dont consider it exercise