[DEinspanjer]

Thank you for this and I hate you. I actually teared up a couple of times as the life guards pulled the kids to safety.

I also had some trouble getting the hang of what I was supposed to do. I'd recommend an interstitial to get people going before the video starts. Maybe something like this?

You are about to watch a recorded video of typical activity at a pool. Help the life guard watch all the swimmers in your half of the pool.

If you see someone who needs help from the life guard, click on them in the video and check the results at the bottom of the video.

Since life guards can't do it (as much as they might wish they could!) don't rewind, pause or click the video while being tested unless you would be ready to blow the whistle, jump in, and swim to someone.

[ipp]

I agree. Clicking the video didn't seem to work for me the first time, so I just figured that wasn't how the site worked and wasn't entirely sure why this was a "Show HN" as I assumed it was probably interactive but seemed not. More helpful (and prominent) text than a single line in the bottom without an autoplay video would have helped, as the text there can be out of view/hard to notice.