It has a few names. Flow, Flow state, Hyperfocus or being 'in the zone'. It's that mental state where you feel fully immersed in a feeling of energ...
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For me, I find that music plays a large part in helping me enter my 'Flow state'. It helps me zone in. Noise cancelling headphones and some chilled beats, alongside feeling well rested, happy and I expect well hydrated, all help me to drill down and focus on the job at hand.