I need help with KVA level 9 Strength class

Hi everyone! 


I've been stuck on level 9 of the Strength class at KVA. I can't seem to pass it even though I'm able to successfully pass everything else at the same (or close to the same) level...

Because my computer (which is still quite new-ish) is pretty fast, I always either go too far above the target or don't reach it enough. In other words, the blue "energy" in the bar always rises and falls too quickly.

I've heard that other people have been able to slow the class down by playing several videos in the background
or running other programs at the same time. However, when I tried that several times, it only worked in the beginning and then the class would eventually speed back up to normal speed again even if the videos in the background were still playing! (The videos I tried running
in the background were music starz videos by the way on my other Webkinz accounts). I've gotten really close to passing, but
always fail with 5-8 reps remaining. I only play 3 videos in the background because I use a laptop and don't want it to overheat.

To those who have successfully done Strength level 9 before on a fast computer (esp. a Mac), how did you pass and what is
your best advice? Also, I use Chrome. 

Thanks!
~Star