vary up
To alter, change, or adjust some variable factor, aspect, or element of something. A noun or pronoun can be used between "vary" and "up." I'd like to start varying up the dinners we make each week—we've been getting stuck in a routine of making the same stuff. You should vary your workout up if you want to really improve your body.
vary up
v. To change the variables associated with something: The cafeteria varied up its menu with a new kind of sandwich. You've worn the same blue sweater all week—why not vary it up and wear something new?