Commands can range in strength from subtle suggestions through to direct instructions.
And the way in which someone gives a command, what they give a command about, and who they give it to, can tell us a lot about the character.
For example, in this snippet, what's the coach doing? Commanding runners to get on the starting blocks. How strong is the command? Is she being clear and direct? Does she expect the runners to obey?
Yes. This is an example of a strong command.