For example, let's take the basic Kata or routine from your art. Do it once, as best as you can. Okay, looks great...but how to improve? How about putting a new weapon in your hand, one you haven't worked with before. I taught a basic Eskrima class to people who had little or no weapons experience, and the addition of an apparatus really brings one's awareness back into the form...instead of just "doing the Kara", now you have to think again! Puts a different spin on the same Kata!
Try doing your kata slow. I mean really slow, with stances lower than you normally would. At my school we call this "low and slow" training. The trick here is to not cheat by making the transitions between movements too quickly....instead think of making the pace consistently slow throughout the form. Your legs in the low stances might remind you they are working. :) You might find your balance a little off, or that you might lose your place in the form a time or two. This "tai chi" type of training can aid in keeping your awareness in each movement.
Sparring: Let your imagination drum up different ways to approach sparring. How about sparring one handed? Maybe not allowing kicks with one leg? How about adding the "push hands" or "chi Sao" sticky hands exercise to your drills? There are many possibilities!
Let your creativity go wild in finding different ways to train your self defense, sparring, forma and fitness. Creativity is one way to beat stagnancy! I would love my readers to share their own methods and ideas for fun alternative training drills and activities.....please post!