I'm something of a masochistic; how else do you explain, amongst many other things, giving birth with no pain relief, eating kale and sitting through the One Direction film at least 5 times? This said, I may be alone in enjoying what I'm about to tell you about.
Since the grand Joining Of The Gym, I've discovered interval running in a big way. Essentially, I run like the clappers for a minute, then run at my normal pace for a minute, and repeat. For 20 minutes. Many things have become apparent : a) when I run at my normal pace, it feels so much slower and easier which is great b) I can actually run like the clappers for a total of 10 minutes (who knew?) and c) I ran outdoors for 25 minutes on Sunday with not as much effort as I used for 15.
I'm certain seasoned runners are already doing this but for those of us not quite at graduation, it might be something to consider. Or not. ☺