I study my martial art (late medieval/Renaissance art of defence with sword and divers weapons) because it is a joy to move with a sword or other weapon of the authentic size weight and balance. To move in conversation with another fencer, and to study the treatises and to experiment with what actions (as we currently understand them) work and which don't. Failures can be from misunderstanding of the intent, a subtle error in the grip blocking a movement needed to close a line down or a step 'assumed' but not stated - or just from size, strength or skill differences between the fencers.
Finding in free play, those patterns that come from drills being 'useful' without thought or planning, just 'this situation calls for my having acted in the way I just have' is a superb feeling,
There are some elements which have broader applicability than 'swords'. All of the weapon arts are built on (and incorporate throughout) elements of grappling, throws, disarms and virtues of prudence, audacity, strength and speed. (or broadly similar sets of useful strengths).
I also move wearing anything from light clothing to fully armoured, in a purposeful and mindful way, gracefully or explosively according to the need. It is something which aids my fitness, improves my focus (at least when someone else has a point standing near my face), and is skills based and not so hard on the body that it cannot be continued with competitiveness into later middle age. I know several very skilled fencers in their 60s who I am cautious of being close to measure with.