Interesting that the TV Series "The Walking Dead" shows up on the Similar Threads.
I think if such a zombie outbreak did hit the US, the show would be called "The Couch Potato Dead".
I have a brisk walk and average 12 miles per week. Over a century ago, some Brit company bought and planned to cultivate a huge (50,000 acres) track of land in Eastern Colorado (flat part). It is somewhat arid. Then, the company (with out a government contract) took the Rocky Mountain streams and build the Highline Canal.
https://www.google.com/maps/d/viewer?oe=UTF8&ie=UTF8&msa=0&mid=zKv3nMUxS8Mo.kgnKU1jmWqg0
Light Green Trail with purple Park connections.
My house is a few blocks from a major interstate highway I-25. There is a tunnle iwth a big bike path to allow the canal to flow. I can get on the path about 3 blocks from my home and take it many directions to various parks. For the harder workout, I have a rowing machine. Yes, I live a mile high where there are no docks or harbors, and row.
In my younger days, a group of us use to take a 5 day cross country trip and stay in snow caves above 8,500 to 9,500 ft altitude. It was a US Forest Service license area, everything had to be packed in/out. We were lucky some Aussie guides were at the base camp. For $50.00 (today's value) they pulled a sled of fresh beer and rum to meet us mid-week. They also hauled the refuse. Otherwise the 40 pound backpacks at that altitude would have been... much heavier going up the slope.
Nowdays, I only make about 10 days of cross country sking in the shadow of Vail Colorado's comfort.
The bisk walks at Denver's altitude 5,280 ft, seems to do the job.
When I visit New York City, NY or Long Beach, CA - I really have a lot of perceived energy. It is like an oxygen mask down there.
Extra time is spent to prepare for my annual walk with my son. Vail Mountain rises from
8,120 feet (
2,476 m) to
11,570 feet (
3,527 m). We have walked up that many times. Once on the top, it is a free gondolla ride down from the ski lift!
Years ago, we started taking the gondolla to the top. From there, a set of paths goes along the ridges from mountain tops to mountain tops.
The alitude can make a medium grade challanging. I take great joy in walking by a group of 20 year old flatlanders who have to stop every 50 paces to catch thier breath. "You really should think about stop smoking kid" I say with as big smile. I don't worry about one of them getting mad and coming at me when we are way up there in the thin air. LOL