Never tried yoga, but I have tried to meditate and exercise. Of course the determination to better myself and have the motivation and discipline to stay with it is sapped by the shit that I'm trying to cure myself of.
Like I'll get super motivated about something for a few days and then become so ambivalent that even thinking about trying it again will make my stomach knot up in anxiety.
Hence all the unfinished work on my computer.
Hell, once I decided that I'd lose my virginity if it killed me and tried to near starve myself while doing cardio an hour a day. I got three days into that.
Then two years ago I had an argument with my best friend which left me horribly nervous for weeks. I decided to try exercising again because of le exercising releases endorphins that make you feel better meme and lost 17 pounds in two weeks, but I didn't feel any better and gave up shy of a month.