Most people waste time warming up by playing scales that are familiar.
Worse yet, they play useless exercises like chromatic scales that they would never use in a real life playing situation.
Use your warm up time better by exercising your mind instead of your hands.
Try playing a scale that you are familiar with, but play a sequence, play triads, arpeggiated 7th chords, or anything else that will force you to think about what you’re doing.
While do play these, you will be forced to slow down a little, which is good because you want to warm up your arms, wrists, hands and fingers, but at the same time you’ll be engaging your mind.
Better to engage your mind than play some useless exercise that brings no benefit to your playing.
This will make your warm up time much more productive.
