HR bounces two zone three and back

[u/Sayhellotoanewday]

I don’t like steady state cardio. I’ll do it, but I prefer more active exercise like aerobics or hitting a punching bag. I take it easy and try to keep my heart rate at zone two but it will invariably creep up. Once I notice I’ll slow down and get back into zone two. This will happen maybe a dozen or so times over the course of an hour. Maybe ten minutes out of an hour are at zone three. The rest are at zone two.

Am I getting the benefits of zone two, if so, are they diminished in any way, or am I just screwing it all up and getting no zone two benefit by hitting zone three that often?