6/13/18. Hiked 15.6 miles today over Muir pass. Snow was hard in the morning so use micro spikes and made good times getting to the pass by 7 AM. As I descended it became more sun cupped and soft often post holing. It 4.5 hours to get out of the snow. Hard morning but great beauty all around. Woke with left pain in the night. Probably overuse injury using poles in soft snow for hours.