What *type* of exercise is yoga/tai chi/qi gong?

[fitloon]

I know those 3 exercises are different and I also know that there's different types of yoga, some more intense than others.

I'm looking into yoga and qi gong. I have a Yoga for Beginners & Beyond boxed set dvd with Barbara Benagh. I've also been perusing Lee Holden's videos on Youtube. Also very interested in Essentrics and Classical Stretch clips.

I try to be pretty balanced in incorporating strength and cardio and stretch during a workout week. Trying to figure out which category to sort these workouts.

For further info, I mostly follow Joyce Vedral for weight training, and Leslie Sansone for cardio or an outside walk. I usually use one of Tamilee Webb's 10 minute segments after these workouts with a longer stretching routine once or twice a week.

Thanks in advance for any responses. It's driving me nutty that I can't seem to get it straight in my head.