Principles of training -- Fitness assessment and adaptation -- Increasing endurance -- Maximizing strength -- Fueling for outdoor pursuits -- Overcoming environmental challenges -- Hiking, trekking, and backpacking -- Alpine scrambling and mountaineering-- Rock and ice climbing -- Trail running -- Off-road biking -- Canoeing, kayaking, and rafting -- Snowshoeing, cross-country skiing, and backcountry skiing -- Flexibility and mobility -- Body stabilization and support -- Strength.