It's flow when it's constant.
Sought by many and mastered by few, flow can be tricky, but it's key to your well-being, and you must find your source to it within.
To some it comes easy, and to others it's the most difficult thing to achieve.
Whatever your relationship with it, flow is an essential part of life, and to deny its importance is to deny yourself.
It's the very cause of your well-being, and without it, you instinctively feel that something is wrong.
That's also why people go to great lengths to find it, and maintain it once found.