Parkour

Thank you all for your advice and posts. How could I not have thought of the obvious health risks.
Though I wasn't recommending everyone leap off 3 story buildings with a rucksack. I was more refering to Citizen Smith's and Wotan's perspective, get over mild obstacles like fences or walls.
Everyone has a different version of what Sit X will be I like to prerpare for the more violent ones in which case there very well may be someone chasing you.
(riots, foreign invasion, Civil unrest, zombies or aliens.) most likely to least likely.
The other key component was staying in shape. Don't wait for Sit. X to try and hike 12 miles nonstop in the heat of midday.

Be Prepared. Which is to say you can never be to prepared. So get in shape and be vigilant and mindful of your surroundings. (Is that last part a star wars quote? )