Kris Stallenberg 75-min Z2 (Endurance) Easy #10 A varied endurance session that combines steady state efforts with slow, gradual power ramps to simulate rolling hills. This 'mixed bag' approach keeps the mind and body engaged, improving your aerobic system's adaptability. It's a perfect example of how to make Zone 2 training, as defined by Coggan Power Zones, both effective and interesting. bike