I experimented with it 2 summers ago for outdoors, but under different conditions… (little training preparation and much work-stress a month prior). Not being as fit and trained as now, I had an impressive (for my records) 200m split (pb of 25.6") during the 400 preliminary round, but being unprepared, I cramped up everywhere at 260m and didn’t finish the race.
For this winter, I wonder if it could help with the missing speed training and explosiveness. (My instinct says I should just stick with the plan, but curiosity and past experimentation won’t let it out of my mind… )