I remember seeing a while ago that Amy Cragg-Hastings did a workout to help her with the finishing kick aka last 10K of a marathon. It was 5 x 2400m @ 82s/lap or 5:28 pace with 2:30 rest. This seems a reasonable enough workout for me right now hoping to run sub-2:35 (PB - 2:36:12), and having done workouts like 4mi @ 5:25 pace in the past.
I was going to modify this workout to 5 x 2400m @ 82s/lap but with a 400m jog in roughly 2:00-2:10. I have two questions
A. Is the original workout useful in the first place?
B. If so, does my workout change the physiological benefits? If so, what system would I be working on instead?