Petra is getting lots of mental exercise by practicing obedience drills. Giving her lots of back to back commands (sit, down, stay, come, heel) at a quick pace gets Petra in a good habit of looking to her handler for the next command instead of thinking about what she wants to do next. This is an excellent leadership activity that makes her obedience skills sharp and helps her focus around distractions. After an exercise like this, Petra is nice and relaxed. Good girl!