My body is giving me a bit of feedback today, some of it in new forms. My knees are a bit sore when I go downstairs - nothing particularly new. What I haven't had before is the twinge in the backs of my thighs when I walk - which suggests that the sprinting last night was reaching a few muscles that hadn't been reached before.

Nothing to worry about, but I definitely won't push the sprinting any harder (as if my lungs would let me) for a while yet.

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