I’m sure that spike at 27 minutes isn’t accurate but still - decent workout!
Nice work here 
We had a very hot summer last year here in Northern California foothills. I lost 3 oak trees on my property and, with chainsaw work and lugging around wood, my watch logged me in Z5 for many minutes and Z4 for a lot more. My property has a lot of slopes, too, so that helped in kicking the heart into turbo 
No doubt with any reasonable amount of movement, weight, and slopes it’s def some good zone working coming up!
