Draw anywhere on the screen, any size you want to create legs and run. Draw specific legs for each obstacle you find in the obstacle course. Draw unique shapes for each challenge you face in the race. Each set of legs you draw should be able to handle the obstacles.
If your legs don't run the obstacle course fast enough then your opponent will likely win the race and you will need to start all over again. So, be sure to draw the right set of legs for your runner to be the best climber in the obstacle course. If your climbing skills are weak, then you will fall down over and over again. All it takes is drawing a nice set of legs to make your character climb the best in the obstacle course