Hi Peter! You have detail us a good dosing system for Zone 2 training. But what about for stretching and flexibility? What is the stretching benchmarks one should have or goals one should be able to reach. Also, how would you dose stretching? In other words, how much or how little and how frequently should you do both static and dynamic stretches. Any benefits to stretching for muscle hypertrophy, strength, muscle recruitment or anything related to neuromuscular function that can help in longevity or performance?Or stretching for prevention? And what is too much stretching or over doing it? think inviting an expert or having an AMA on this topic would be awesome! Many thanks!