Judo for two years but stopped because I was only 9 and not really interested.
Karate for two years, stopped because I wasn't motivated enough to give up the time I needed for VCE (I didn't know any techniques or have any habits which helped improve productivity back then).
Kung Fu (Liang-I five animal style) for two years until my motivation hit a wall again.
Qi gung for 3 months. The focus was heavily on the energistic side of the practice which, for me at the time, was not what I was after. I wanted an activity that actually felt like exercise.
I'm doing yoga at the moment, have been for around 8-10 months. Out of all the activities I've done for exercise yoga is easily the most rewarding, motivating and energising so far. I'm glad it was included in the list even if I wouldn't consider it a martial art