Quick Edit: YouTube has resolved the issue and the player now works on iOS 9 - 12.
We've had a few reports of YouTube playback issues on iOS devices ranging from 9-12 (iOS 13 seems unaffected). Specifically "tapping the play button and nothing happens".
This issue impacts more than just FitnessBlender.com, but we are still digging into it.
If you run into this issue, a temporary work around is to double tap the right side of the video instead of the play button (to trigger the 10 second skip).
I'll keep everyone posted as we find more information.