Csikszentmihalyi identified nine indicator elements of flow: 1. Clear goals exist every step of the way, 2. Immediate feedback guides one's action, 3. There is a balance between challenges and abilities, 4. Action and awareness are merged, 5. Distractions are excluded from consciousness, 6. Failure is not worrisome, 7. Self-consciousness disappears, 8. Sense of time is distorted, and 9. The activity becomes " autotelic " (an end in itself, done for its own sake)  His studies also show that flow is greater during work while happiness is greater during leisure activities. 
When we think of the word “positive,” most of us probably think “happy.” However, happiness isn’t the only type of positivity. There are many ways to be more positive in your life, even when you’re experiencing sadness, anger, or challenges.  Research suggests that we have powerful capabilities to choose positive emotions and ways of thinking.  In fact, our emotions literally change our bodies on a cellular level.  Many of our experiences in life are a result of how we interpret and respond to our surroundings. Fortunately, rather than repressing or trying to “get rid” of negative feelings, we can choose to interpret and respond to them differently.  You’ll find that with some practice, patience, and perseverance, you can become more positive.