Don't go too hard on the first one, you're aiming for a consistent hard effort across however many reps so better to hold back a little on the first one or two efforts so you have enough in the tank to go just as hard for the last ones without fading.
You might prefer to walk down some and then jog the rest so you're already running when it's time to go for the next rep, as opposed to having to transition from a walk to run which I think is harder, if only mentally. But do make sure you are gettin genough recovery, your HR should come right back down between reps.
I generally find my second and last efforts tend to be the fastest. Second because you're more warmed up but still fresh, last because it's the last one so can go all out and don't need to hold back for the next rep.
Don't go too hard on the first one, you're aiming for a consistent hard effort across however many reps so better to hold back a little on the first one or two efforts so you have enough in the tank to go just as hard for the last ones without fading.
You might prefer to walk down some and then jog the rest so you're already running when it's time to go for the next rep, as opposed to having to transition from a walk to run which I think is harder, if only mentally. But do make sure you are gettin genough recovery, your HR should come right back down between reps.
I generally find my second and last efforts tend to be the fastest. Second because you're more warmed up but still fresh, last because it's the last one so can go all out and don't need to hold back for the next rep.