Notes
3.1 miles on treadmill @ 12.5 % elevation, 2046 feet vertical gain. This was a HARD 5k! Could not run a 1 mile on the flat track afterwards due to mild but threatening cramping that started in my left calf.
Cramped up later that night at home, left calf. A screamer! also had breathing problems in bed, out of breath type. Probably over-exerted myself - my heart felt exhausted!?