这个Zone 的区分是 极限 （5）， 无氧耐力，有氧耐力， 燃脂，和热身 （1）， 对吧？
为什么这里说 Zone 5 最多 一分钟？我跑步 至少 > 50% 时间都在 Zone 5 是不是过于蛮干激进？ 或者这个 max hr 每个人也不一样？ 跑步超过20分钟的 Zone 5 应该是不可能？
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.
