This workout is really interesting, because the running laps feel impacted by the puzzle-solving times. A faster puzzle (yay!) means less rest and a slower subsequent lap (boo!).
During the first set, I was cruising through 92's on fresh legs and the puzzles didn't have that much variation.
And starting the second set, look, another 92! But then I crushed that puzzle in 37, which forced the next lap slower at 95. Followed by another fast puzzle, which forced another slow-ish lap at 94. Then some slower puzzles pushed the lap times a little quicker again.
Of the two sets, the second was faster (yay!), but the running was actually a little slower (boo!). I also feel that not all Q-Bitz cards are created equally. If you swap the second-slowest of the first set with the second-fastest of the second set, both sets were essentially identical.
In other words, despite having objective results like lap times and such, it's hard to compare the workouts exactly apples-to-apples because the puzzles range a little bit.
It's still a fun exercise, and subjectively, I can feel improvement with it.