Variation on a Theme

Made it out again today for a 4-miler. It was nice, mild but sunny, and the breeze wasn't too cool. For variety I threw in some intervals/strides/fartleks, whatever they're called. All these years of running and I'm not sure what the appropriate term is. I went without my Garmin and so it was more of a relaxed, do-whatever-I-want run,.