Summary Page - Number of times I stretch (Read 283 times)

I see that I can put a box on my summary page that can show how many times I lift weights in a month, week, etc.  I would like to make the same kind of box for stretching.  It seems, though, that weights is the only one with a count rather than a distance.  Could it be possible to create an activity that works the same way as weights rather than have all activities I create have a distance attribute?  I would like to make boxes for core and for stretching so I can keep up with how many times a month I manage to do those things.  I would just like a count, not an entire graph.