Climbing this winter
Last winter I was having trouble with numb fingers etc...this guy from Colorado recommended putting my hands in a cooler full of ice until I couldn't stand it anymore, then take them out and warm them up, then repeat a couple of times before getting on my first route. Idid this at Miguel's and by the time I got on the cold rock at the Motherlode, my fingers were adapting to the cold a lot better.
Hauling a big ego up a route adds at least a full grade.