X-C Skiing intervals (Kingdom Valley Trails) 1:20:00 11.13 km (7:11 / km) +155m6:43 / km weight:158lbs
Warmup, then 10 x 1 min intervals flat out going up the Porcupine Trail. Didn't feel like puking, but did want to pass out a couple times. Must be something about the thick air around here.
Bunch of cool off laps.