Precisely. Something you can cool down from a run with or use a few minutes of down time while waiting for something or someone at any time of the day. I find that I already carve out enough time during the day for running. I can't justify carving out more time for peripheral activities so anything that can be done in a few moments is what works best. Honestly, I've also found that, even when I had time, those same exercises happen to be the most effective.