Answer:
Withdrawal stage
Step-by-step explanation:
For many people seeking to get over an addiction or put away a bad habit, they usually go through different stages while trying to stop the addiction or bad habit.
Here, Harry is in the withdrawal stage of this addiction to drinking. First, he has joined a running club. Joining the running club can serve one out of many purposes which is trying to keep him healthy and away from alcohol. He is withdrawing from drinking by staying healthy and running in his spare time to overcome the alcohol addiction.
His second act was avoiding his coworkers who are also his drinking partners. He's trying to withdraw by deliberately keeping himself out of reach of alcohol and friends who would make him drink.
The withdrawal stage in any addiction treatment is one of the hardest stage because the recovering addict feels the string urge to indulge in his addiction but he does other things to keep his mind off it and avoid all triggers.