I bought this app thinking it would help me with my Taekwondo skills. I myself am a blue belt. Although it helped me with remembering the names of my forms, it did nothing else but add storage to my device. For one you can only watch the video (notice how I said “video”) of basic I form 1. Everything else is expensive. And the “grandmaster” that does all of the forms is not firm during the videos and the videos are also low quality and only set in one position. And although it has no ads (thankfully) the makers of this app were not very interested in teaching you the forms, they were just trying to scam you and take a little cash off of you, just like all of those other apps out there. Want some advice? Just search billy woo on youtube. He has a lot of good videos on there in slow motion, mirror, and back view.