Any physical training tends to have some benefits in other areas. The benefits are rather indirect, however. It is true that some martial arts will benefit your ability to play almost any sport, but the most direct path to improving any sport is almost always practicing that sport itself. Improving general fitness is obviously beneficial; it has even been show to improve mental functioning. That being said, the best way to improve something is usually to do the thing itself. At least part of this is motivation; if we are interested in something we are more motivated to pursue it.
That being said, sometime fundamentals for any pursuit seem monotonous. We may have trouble forcing ourselves to follow them. But is we want to get anywhere with any sport, art, musical proficiency or other interest we need the fundamentals.
Matters take on a different perspective when we factor in mental discipline. If any martial art helps our ability to focus then it will help in all factor of our life. What also helps is the knowledge of our own progress. We remember what we were like on the first day of a new task, and we can compare it to our present ability. The fact we are successful in one pursuit shows that we are able to be successful in at least some others. This gives us the type of humble confidence that says: I’m not yet able, but I can become able.
Taekwondo has been mentioned as beneficial in every area from child social skills to golf. The reasons given for this vary. We don’t suggest giving up your career or hobby just to pursue Taekwondo, but you may find taekwondo gives the others areas of your life the little boost they need. If physical or mental ability is a part of what you do, then marital arts will be of at least some benefit.