First, I want to confirm the grammatical correctness of the following two sentences:
I'm in the running for the position.
I'm in training for the position.
In other words, if using the word running is it right to put the article before it and if the word training is used is it right to not put the article before it? And, if both are correct, what is the grammatical rule that governs when to use the article and when to leave it out?