Did the TSX Challenge - one week, 75 mile trans-Sierra trail that crosses Sequoia and Kings Canyon National Parks to Mt. Whitney. Did an aggressive ascent to Colby Lake on day three, and then Colby Pass (elev. 12,000 feet) and across the Great Western Divide on day four. Then traversed the Kern River basin before building on the ascent to Mt. Whitney on day six. Twenty miles of hiking to the south completed the trip.