The best of the best are the best because they consistently worked to get there. They did not have intense spurts where they were awesome followed by long droughts of bad productivity and no self-discipline.
You are a high performer because you apply consistent action, not intense effort occasionally.
Find a way to apply consistent pressure, consistent habits, and consistent efforts in everything that you do.
Relax the intensity and focus on ease of entry. Make it easy to go to the gym, to keep up with email, to have 30 minutes set aside each day for that really important task.
30 minutes each day is much better than cramming and panicking for the last 5 hours before the paper is due.
Consistent action rather than intense effort.