Just an idea for martial arts oriented RPG game system I settled with: mixed leveling-skills approach.
Simply put- skills have some basis number but when are not used they are fading below the basis- but recovering to the basis is rather faster than achieving the basis. Also when skill is grinded it can go over the basis for a while. Of course top notch skill fades faster then average.Leveling is mentioned as maturity thing- experience big loss, betrayal, sacrifice, crippling etc. It apparently when applied (by percentage) increases the number of repetitions written in for the chosen skill or technique. Also I can imagine some diversity of skill or technique applied can be implemented.
So it gives characters core skills but they can still come up with some different strategy for a significant duel.
Over that each technique is consisting of the same components (with different mixture) which based on how they are placed in the execution coordinates and part of body that is used makes them relevant to other skills or techniques. For example drawing circles in the air with your feet can make your puch better since it is a stability chalenging exercise (technique).