Hi Victoria, Yoga may be a very good thing for you. Not only for physical health by emotional health as well. I can see where you bf is coming from with the kickboxing and anger related issues but Yoga teaches you how to center yourself and focus your energy, which may by more constructive in the end.
I love my iPod too...I have all kinds of music in there from meditation for those really bad days...to rock when I am in a mood, an pop which I always like to listen too...weird that way I guess.
I have always been pretty fit...ran track in high school, volleyball and was on cheer team even though I graduated in 92...eons ago... . My physical illnesses have slowed me down a bit but I try to stay active as can be