https://blog.wongcw.com/2020/11/11/apple-watch-solo-loop%e8%88%87%e9%81%8b%e5%8b%95%e9%8c%b6%e5%b8%b6%e8%bf%8e%e4%be%86%e9%87%91%e6%a9%98-%e5%8c%97%e6%96%b9%e8%98%ad-%e7%b4%ab%e7%b4%85%e6%96%b0%e9%85%8d%e8%89%b2/