As a *Bloatrunner* you have to collect keys to open the gate at the top of the level. However running costs energy, and as in any endurance event energy management and correct fueling is of utmost importance. By running your glycogen reserves in your muscles will deplete and need to be replenished either from food or from fat reserves.
Your running kit has some small pockets to store a few gels or packets of gummi bears for fast energy replenishment. You will find replacements from time to time. In addition there will be other food items distributed over the levels.
However as in real life it seems that most food items are unhealthy and for some reason irresistable so they are consumed immediately. Similarly for some reason it seems that food turns immediately into fat and takes forever to burn off. And too much fat makes you slow and even worse might make passing the finish gate a squeeze or plainly impossible.
And then there are the _others_, which for some reason can run without getting tired, eat without getting fat, and generally make a nuisance of themselves. Close contact with these makes you lose the will to live and turns you into a couch potato, ceasing to be a _Bloatrunner_.
A freak accident involving some radioactive meteorite allows you to create craters at will, well, more like potholes. But big enough to let the _others_ fall in so you can pass over their head.
So now, go out, collect the keys and maintain a healthy diet!