Some goals, like strength-training, can have multiple aspects. One aspect is how often you do the exercise itself (e.g. am I going to the gym twice a week?) while other things include the repetitions you do and the amount of weight you use.

It would be nice if beeminder could plot this metadata and associate it with the given goal. So I could see a graph of my weight lifted over time, but only beemind my actual gym visits

Based on the thread "reminder (or goal) to record weight" in Akratics Anonymous.