Workout Video - see above "Gym Membership" with one exception, you've not only made the "You're Fat" statement you've also made the "I'm Cheap" statement. We call this a lose-lose.
Yoga or Meditation video - if you "must" buy a "Self Help" DVD may we suggest Yoga or Meditation. These are both popular right now and really don't say anything other than I like you and you like you... very innocuous and "safe."