Children run a course while trying not to drop an egg/rock.
Take a spoon and a rock or an egg.
Make a start and finish line.
The child needs to lay the egg/rock on the spoon and walk as fast as possible from the start to the finish line without dropping the egg or rock on the ground.
You can make it harder by adjusting the course. For example, let them step over some stuff or let them zigzag around something.
Or you could ask the children to take the end of the spoon in their mouth while running the course.