I love the condition known as 'Flow', it is my favourite state of mind to be in. Here is the wiki link
https://en.wikipedia.org/wiki/Flow_(psychology) .
To get there you need to push hard enough for the activity to completely occupy your attention, but not go too far so that it stresses you or you will pass through the state. The activity needs to be hard but not stressful, and can be mental or physical in nature, both is ideal.
Time will pass very quickly, you lose yourself to what you are doing, and feeling is one of bliss, a high state of happiness. The feeling after is similar to after good sex, but less physically draining.
Flow is the best reason to push yourself a little harder/ challenge yourself when you do a familiar activity. Particularly good on the mundane activities such as cleaning the house.
I have trouble achieving "Flow" while cleaning - but I know that exact same feeling. I get it while I am writing or while I am crafting - perhaps painting or bent over a sewing machine with scraps of fabric surrounding me. It isn't zoning out... Not really. It is just being so intensely focused on your project that nothing else exists.
The world fades away. I fade away. There is nothing but my hands and my tools and the creation unfolding before me, blooming more beautifully than I had imagined. And there is nothing but satisfaction and happiness. It is losing yourself in the now, in your creation (or action, in the case of mundane activities). There is no anxiety. There is not sadness. There are no thoughts. It is just... pure being. Immersing yourself so completely into your project that it feels as if you are apart of it. Or it is an extension of you. Sometimes, I can achieve the same feeling while dancing. Feeling the music pulse, aware of each nerve dancing in my body, aware of each movement of muscle, feeling free in a way that words cannot describe. Feeling both free and yet a part of everything, all at once. It's.... almost pure euphoria.
It is truly one of my favorite feelings in the entire universe. And it is a bit of a high. i wish I could achieve that feeling with mundane activities - I think that takes a bit more discipline than I have (right now).
For mundage activities, I try to think of the book, "The Power of Now" by Eckhart Tolle, though it has been a while since I have read it. Normally, I am used to spending such mundane activities brainstorming novel plots and just zoning out and daydreaming. But Tolle speaks about how much humans spend too much time thinking of the future - daydreaming about days that might never come or reminiscing of the past, that the present, the NOW gets completely forgotten. But the now is all we have, really. So by being aware of each moment as it happens, and appreciating it, we shall be much more mindful of our life. Appreciating each moment, whether it is big and adventurous or small and mundane - the point is to focus on what is happening Now. We can find such happiness by appreciating every single moment.
Such as dishes. Focusing on how the warm water feels soothing against my fingertips, and how the light bouncing so beautifully against the soap bubbles and causes rainbows to dance against the porcelain of plates, and how it feels GOOD to wash away dirt and grime and make things clean again. Add in amazing music, when I can appreciate the happiness of a good beat and swaying hips and laughing at the pure joy of it all.
It's about finding joy and appreciation in even the most "boring" of activities. Basically, appreciating every moment of Now. Not letting yourself drift away into a world of daydreams, but remaining in the moment - and finding the perfection and happiness that can lie within... That's how you can truly be happy with your world and your life and yourself.
As someone who usually juggles a half dozen activities at once, this is definitely a struggle for me. But I'm determined to master it some day. ^_^