Fewer and fewer people could actually go very far if they had to "run for your life".
Our culture is not the walking culture of Jesus and the Apostle's so we have to build in times to exercise our bodies. What if you had a word from the Lord to do something and then were told to "run for your life"? How far could you go?
2 Kings 9:
A walk/jog/run is a great exercise that prayer and meditation easily adapts to.
What if your physical conditioning limits what the Lord would/could ask you to do?
Take the limits off, and start somewhere, doing something. After a week, add about 10% and slowly increase your walk/jog/run. After a long time of being consistent, you will begin to experience the Lord calling/asking you to follow him into more and more places to more and more people.