Once the amateur’s naive approach and humble willingness to learn fades away, the creative spirit of good photography dies with it. Every professional should remain always in his heart an amateur. -Alfred Eisenstaedt
Challenge yourself
Begin with the APK Warm-Up.
Now find a difficult challenge. Do whatever you are inspired to do; make sure there’s a point at which you want to quit but you don’t.
A long run. A hundred repetitions of a precision jump. Hold cat-hang for 10 minutes cumulative time.
Those are just a couple of examples, something that is difficult for someone may be easy for someone else, so challenge yourself to your level.