I'm amazed at how quickly you can lose your stamina too! Or at least that's how I'm feeling. I've bumped my speed up on the treadmill and now (after my sick breaks) I'm struggling to get 35 minutes (just over 2 miles). The first 20 minutes felt good, after that I was playing games with my mind to keep going.

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When you get to the end of your rope, tie a knot and swing.