One week on from graduation, I tried my first interval run, mixing bursts of fast (for me) running with walking until I got my breathing back under control. It was noticeable how much harder this was on knees, hips, ankle. At 58 years old I have regularly noticed transient stiffness after running (wears off after you move a bit) before but have not experienced anything like this before. Will see how I am tomorrow before deciding if/when to repeat the idea.
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