Words mean different things to different people. For most people, "routine" means customary or run of the mill. My routine involves getting up, showering, eating breakfast and going to work.
For performers, "routine" means a self-contained part of a performance that is well rehearsed and ready to be shown to an audience. Here are some fun examples.
These news anchors do a little "routine" during the comercial break.
Here are some musicians doing a really nice and well practiced "routine."