Yes, you really only need to do some Tabata to keep your exercise quotient in a healthy range. It won't build marathon level cardio, nor muscle, but it will keep your cardiovascular system and body reasonably healthy for small time investment.
Go so hard that you can't have a conversation and are in around 80% of HR max.
I think walking, and low intense ex is good for things like mental, reflection, etc. General refreshing. But if you need to get exercise in but dislike it, or don't have the time, HIIT is gooooood. :)
>Go so hard that you can't have a conversation and are in around 80% of HR max.
Does that make easier to get a CVD event while doing so?
Because for sure it does make it easier to get a regular accident or strained etc while doing it.