I have done a lot of mistakes while trying to grow a product. [You will see my list down below] From knowing nothing about product growth, to too many expensive experiments, I have come a long way and I continue to learn. I am curious about what are some of the methods/channels, that you know through your experiences, that just don't work at all. (This of course totally depends on the kind of products as well) P.S: You should pick up Traction by Gabriel Weinberg and Justin Mares. It's a good starting point to identify right channels.
Easily create customized workout routines using exercise videos from Youtube. Then just follow along with your workout video. It will tell you how many times or how long you have to do an exercise (and you can add breaks too)!
You can also edit each video, trim it, loop it or time it. It also speaks the exercise name using Google's Wavenet TTS.