Be present

Spend more effort on concentration.
Concentrate on the task even if there were a million other fun things you could be doing.

Learn to embrace your distractions.
Train yourself to deal with distractions. For example, learn to stay focused even amidst your favorite music while competing.

Relax in brief moments of inactivity.
Players who relax in moments of inactivity are almost always the ones who end up coming through when the game is on the line.

Meditate for a few minutes a day.
This will help connect your physical interval training to the mental arenas.

Incorporate the rhythm and stress.
Take a minute or two breaks and then continue with your task.