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.

Nice plan. Just remember to keep the intervals sharp—like 30‑second bursts with 60‑second rest, so you’re still on the edge but not dead. Watch your heart rate; if it hits 90‑plus for too long, you’re over‑burning and the brain will pay the price. After the first three rounds, we’ll see if the focus score jumps with a higher carb kick‑in. Don’t be afraid to swap a quick walk for the recovery if your blood sugar’s dropping—fuel the brain before it’s starving. Let’s get those numbers on the board and crush it.