Generally the most important aspect in rising the quality of the practicing process is reducing the material that is being practiced at a time and rising the concentration level through it. So after analyzing the piece, devide the piece into small sections and practice every small section separately. It is essential to mention that the beginning of the next section should always be added to the section that is being practiced. Then it is easier to connect the sections later naturally.
Often pianists practice session starts with full concentration and intelligent approach. From one moment on the temptation to play fast and just enjoy playing can win the patience and the benefit from practicing diminishes tremendously. It could be a sign of getting tired and reason to end the practice session and continue after a break.
Why not to learn a bit from sportsmen and use a very simple way to improve the development of our muscules that participate in piano playing.