Conditions: 94 degrees/47% humidity/102 Heat Index. Goals: sub 22:00 time without injury. Results: Time 22:01 (PR) & got a minor shin splint due to a tight turn (getting old). Choose not to sprint to the finish to avoid further aggravation to left hamstring. Note: "Smoked" my friend & competitor by 1:30, which felt really good, especially since he is equally competitive and he told me, "to savor this one as it might not ever happen again."