The Sweet 16 of BSA Safety describe the measures we should use at all Scouting activities. The fifteenth point of the Sweet 16 is CPR Resource (see below).
BSA seems to leave it up to you what a “strenuous activity” is. Chances are your unit participates in some sort of strenuous activity from time to time. Why take a chance? Encourage some adults in your unit to learn CPR. It’s one of those things you hope you never need, but if you do it could save a life.
From the Sweet 16 of BSA Safety on the Scouting.org website:
15. CPR Resource
Any strenuous activity or remote trek could present a cardiac emergency. Aquatic programs may involve cardiopulmonary emergencies. The BSA strongly recommends that a CPR-trained person (preferably an adult) be part of the leadership for any BSA program. Such a resource should be available for strenuous outdoor activity.