I want to learn martial arts for two months. I'm interested in traditional martial arts, and I also keep fit. I met a master who taught me mantis boxing.

That's a good idea. However, you should know that you can keep fit after only two months of study, and the actual combat skills are almost useless. However, if there is a master of mantis boxing (not necessarily a famous teacher) to learn, don't worry about the length of time and the level of martial arts. As long as you know martial arts, your goal will be achieved. Don't learn martial arts if the master is average or even average. This is not the only way to stay healthy. Mountain climbing, swimming, running, doing exercises and so on are all good choices during the holidays.