The modern working environment is making our ability to focus on a huge issue: Open-plan offices, social media, etc.
When you need to do deep work, remove the distractions and work on a single task. The task will get done quicker and to a higher quality.
How much time you should spend on deep work will depend on your job.
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Use an app to get you into the routine of doing certain activities daily and weekly.
At first, it might feel silly to write day-to-day tasks down in an app, but the process of ticking them off and tracking your progress helps to get you into a routine.
If you find your mind frequently jumping around, an app can be life-changing to help you focus.
It can train you to notice when your mind is wandering, and help you to get back on track.
E-mail can destroy your focus.
Read up about the daily routines of other CEOs, sports stars, etc.
You might not find an exact routine to suit you, but you might find some amazing ideas to use for your own life.
Doing more than one task at once is completely anti-productivity. It is nearly impossible to concentrate on two tasks at the same time. This way of working is inefficient for focus and deep work. If you are doing shallow work like washing the dishes, multitasking works.