What to classify my workout?

Health tells me I have a 27.1 V02max. I believe it’s because I’m using Outdoor Walk, but my routine consists of repeating round trips on stairs(110 steps), with either pushups, planks, ab wheel, sit-ups, or crunches when I reach the top. I do mix in a few minutes of flat surface walking during my workout. My heart rate stays between 140-160 with occasional trips near 170 and 130. It takes about 30 to 40 minutes to cover a mile, workouts last from 45 to 90 minutes. Try to do this 5 times a week. 54 y/o male, 5’9” 192 pounds. What classification do you think I should be using jnstead of Outdoor Walk to more accurately capture my exertion level? On a related note, I’ve been doing this off and on for the last year. How long will it take before my VO2max resets to a more accurate estimate? Should I try to clear my data and restart? Thank you for the advice!!