Think of those as event counts in an arrival process, then think of the events as impacts or strikes, and eventually you can come to the unit of countable Hurts.

These counts have implicit measurement windows since they are aperiodic. Rather than Hs representing "counts per second" akin to Hz being "cycles per second", I think we should combine it with an explicit window annotation. So 100 Hs/1s is the same rate as 6000 Hs/60s but with one second versus one minute counting interval.