Sit down on a chair or stool. Back straight and unsupported, arms relaxed by your sides.
Have someone read the rest of this to you step-by-step.
Close your eyes.
Begin to breathe evenly and intentionally (eg. 3 - 4 seconds in through your nose, 3 - 4 seconds out through your mouth). Make sure you keep your breath moving throughout this exercise.
Close your fists. Hard.
Let that tension move up through your arms all the way up to your shoulders. Remain upright without any excess tension through your neck and torso.
Maintaining all of that tension over the course of 4 - 6 seconds, bend your elbows bringing them from a completely straight position to as bent as they can go. Squeeze at the top.
Now, at the same pace and maintaining that same tension, straighten your arms again. DO NOT RELAX.
Repeat steps 6 and 7 until you feel you should stop.
If you did that as intended from my end, then you might have had quite the physical experience.
Now, imagine a modicum of that same focus in all of your exercise efforts. The intuition that it might change your exercise experience and outcomes on the whole is absolutely correct.