RIP, Dr. C! The godfather of flow research, Dr. Csikszentmihalyi, recently passed, and I felt it was important to reiterate the conditions of flow here:
Challenge meets skill level
Action and awareness merging
Sense of total control
Time transformation
Concentration on the task at hand
Clear sense of goals or purpose
Loss of self-consciousness
Unambiguous feedback
Autotelic experience (intrinsically rewarding, in and of itself)
Look at your sport engagement. How many of the above are you experiencing? How often? How can you create routines that help you reach these conditions more consistently?