When a passage becomes more urgent, several things may be changing at once. A simple tapping exercise can help you isolate one of them: how far apart the beats arrive. Keep the volume modest and let the spacing do the work.
Begin with an even pulse
Tap one finger softly on your other hand at a comfortable pace. Let the taps settle before changing anything. There is no target speed and no need to count a long sequence. The first task is simply to notice whether the gaps feel reasonably even.
Shorten the gaps gradually
Bring the taps closer together while trying to keep their force similar. Then return to the original pace. If you start striking harder, stop and begin more gently. That tendency is part of the exercise: your movement may link speed and strength even when you intend to vary just one.
Next try the reverse, gradually widening the gaps. Distinguish a smooth change from a sudden switch between two steady speeds. Either can be musically interesting, but they give you different shapes to describe.
Transfer the question to a recording
Choose a short passage and ask whether you hear shorter beat intervals, stronger sound, additional layers, or some combination. If you cannot identify a steady beat, leave the speed judgement open rather than using excitement as a measurement.
Return to the beat, tempo and rhythm introduction for the basic terms. In your listening note, try “the pulse seems to quicken while the texture stays spare” instead of “it gets bigger.” The wording records a specific impression that you can check on another listen.