well.. time to shut down running for a week or two. my left calf & hamstring / hamstring tendon are jacked up.
woke up at 6 AM today, felt great. ate, got out of the house around 7. Did several warmup runs/sprints on the way to the track. Felt really good but did feel my hamstring tendon slightly; it came and went. So that warmup was ~4 mi, in exactly an hour. I'm wondering if that 1 hour of walking with a few light sprints mixed in, was enough to cause my hamstring/calf to fatigue/tighten... if so, very odd. I mean I felt fine, 1 hour of "travel" doesn't bother me at all.
anyway, began track workout, this time starting with a slow 400 instead of fast.. so alternating slow/fast/slow/fast/... I figured the slow run would be good to gauge my hamstring/calf. Interestingly, on the first slow lap, I felt my left calf tightening.. and this is using my simple heel->toe form that I can run forever on. It got progressively worse each lap until finally I ran really slow for 1 mile (mile 4) to see if it would go away, and it didn't. So I stopped, which i'm really glad I did because my calf/hamstring might have exploded had I continued.
lame

the sad thing is, I was running good and I was holding back quite a bit, worrying about my calf.
First fast 400m was ~5:25 (~11 mph) pace. I think it was ~1:20 for that lap.
mile splits (min/mi): today vs last week
- mile 1: 6:11 vs 6:50
- mile 2: 6:46 vs 7:12
- mile 3: 7:08 vs 7:41
- mile 4: 8:25 vs 8:17
- mile 5: vs 8:27
being wrecked, alternating slow/fast 400's, still ran a 21:08 5k... that's kind of cool.

had I been able to run without worrying about my calf, was going to be a sick workout.. really sucks.
so anyway, it's definitely turned into a legit issue so.. going to shut down running for a week or two unfortunately.
the ~4 mi walk home was pretty brutal.. I couldn't run, even if I had to, to survive. I felt really injured. Calf/hamstring were very painful/jacked up. I feel alot better now, but stretching is painful, so not going to stretch if I feel any pain.

pc