See your warm up like this?
If you develop a short workout up about 10mins. and see it like this.
If it is repetitive and familier you can gauge how well your hands are performing and ready for the playing to come.
Your warm up should be a familier routine that you use every time before you play, you should know it inside out.
It is not meant to be interesting as such, what it is, is a warm up, getting the body, hands, and finger muscles loose, getting the blood flowing, and giving you that familier feeling of doing this before.
As such it can relieve tension, because it is familer to you, not any given playing situation. The big thing is if one day you struggle in your warm up, you know something is not right, so it is a benchmark on your usual skill level.
So now you may want to do some additional stretches, take in more fluids, have a energy bar, and try again and see if 'normal service' has returned.
If not then do not over play or strain yourself as your body may not take it, play within yourself.
Warm ups should start easy and gradually build in more, as should warm downs after you have finished playing.
Keep them short and keep them functional, you should not feel tired or sore after a warm up, you should feel ready to play.
Mine is about 5mins and includes stretches, rubs and a few playing exercises of major scales up...minor scales down over a short cycle of 5ths, then some triads, then some arps....and has been for over thirty odd years.