這個Zone 的區分是 極限 （5）， 無氧耐力，有氧耐力， 燃脂，和熱身 （1）， 對吧？
為什麽這裏說 Zone 5 最多 一分鍾？我跑步 至少 > 50% 時間都在 Zone 5 是不是過於蠻幹激進？ 或者這個 max hr 每個人也不一樣？ 跑步超過20分鍾的 Zone 5 應該是不可能？
https://www.shape.com/fitness/training-plans/how-find-max-heart-rate-train-personal-heart-rate-zones#:~:text=You'll%20be%20unable%20to,maximum%20output)%20and%20build%20strength.
Heart Rate Zone 5: Maximum Effort (90 percent to 100 percent)
Zone 5 is an all-out, max effort that will likely have you gasping for breath. You'll be unable to maintain a heart rate training zone 5 effort level for more than a minute, tops — but by sprinkling zone 5 efforts into your workouts, you'll improve your stamina (the amount of time you can work at your maximum output) and build strength. Some zone 5 workout moves might be pushing a sled as fast as possible, a Tabata set of battle rope slams, or hitting your one-rep max in squats.
