Suggestion: change the activity entry type to use the same settings as meltdown
I've been using Activity entries to track my daughters physical activity to ensure she gets enough exercise. My feedback on using it for this is that it would be great to use the Meltdown Low | Medium | High buttons to record the intensity of the activity and Duration field for Activity entries to give better data about how active the child has been.

This is now available on the web, and will be coming to mobile in the next update (coming soon ;)
Try it out and let us know what you think!