A joggers park seems to be pretty much analogous to our lives. People jog/walk/ run over the track depending upon their fitness and needs just like different kinds of people who live in this world for various needs.
Similarly , there are different kinds of people living in this world
Depending upon the efforts and constant practise , they slowly move towards/steer towards their objectives. One shoud note here that the objectives are different for different people depending upon what they are currently and it would only feasible for them to reach it. Just like a fat person who can only jog to burn the fat , a person with bad karmas can only try his best to negate his accumulated bad karmas. Even though a fat person might have the aspiration to race in the olympics, it is definitely out of his reach . This is just like a person who wants to reach god but has lot of bad karma (dirt) left in his pockets. Hence , it becomes ultra-critical to cleanse ourselve before we can ever get closer to the state where the doubts about god fade away. Only then a person can become truly religious. How can this be done ? Just like a person who aspires to become a marathon runner seeking a help of a guru/ professional to expedite the process , a spiritual aspirant should seek the help of the right guru while constantly having the faith in God.
Apart from this , there is yet another class of people who hate/lazy to jog and hence they don't jog. They simply laugh at people (esp fat people) simply because they can't jog. These are like the atheists who don't have faith in god and these folks laugh at people who have the faith.
Now, Why and Where are you trotting?? :)