Sounds like a wild idea, but I love a good experiment. First, nail down your macros so you know what to fuel—carbs for the intervals, protein for recovery, fats for the brain. Then set a baseline: run your 90‑minute sprint, track calories burned on a wearable, and log how productive you feel afterward (maybe a quick 5‑minute focus timer). Repeat a few times, tweak the interval intensity or recovery length, and see if the numbers climb. If the burn stays flat or the brain feels foggy, dial back the HIIT or add a pre‑workout carb. Let’s crunch the data and see if you’re really smashing both the gym and your to‑do list.