After 6 months, got back up to 24 miles with great difficulty. It seems a full marathon is going to entail collapsed arches. It makes lions wonder if an orthotic can be fitted to a sandal. It's going to take a return to shoes to ever do another ultramarathon. Doing it in 12mm sandals definitely hurt, but 12mm sandals previously led to less posterior tibialis pain. Surprised 1 speed event in July caused so much regression, but metabolic changes in old age are ending the party. Trails might be easier on the posterior tibialises. Today's effort featured an 8.5 minute program on the way up & a 9-12 minute program on the way down. Actual top speeds were in the 8m45 range. The final mile was straight walked. Tried going without electrolyte & didn't cramp but did become quite stiff. Felt the borderline of cramping & went to walk/running. Still finished with salt deposits, so some electrolyte was being shed. Some sort of el...