Update: I've since discovered that my test above had a build configuration issue — HKWorkoutSession was still running in the background during the "frontmost only" test, so these results don't reflect pure frontmost behavior. I've re-tested with proper instrumentation and will post corrected findings in a follow-up reply shortly.

Update: I've since discovered that my test above had a build configuration issue — HKWorkoutSession was still running in the background during the "frontmost only" test, so these results don't reflect pure frontmost behavior. I've re-tested with proper instrumentation and will post corrected findings in a follow-up reply shortly.

Update: I've since discovered that my test above had a build configuration issue — HKWorkoutSession was still running in the background during the "frontmost only" test, so these results don't reflect pure frontmost behavior. I've re-tested with proper instrumentation and will post corrected findings in a follow-up reply shortly.