Multi tasking is your enemy unless the tasks are "no-brain" ones.
You may be able to do a sit-to-stand exercise, scroll through your phone and listen to your friend parallelly (well, unless your friend says something very thoughtful which is rare))). However, any intellectual task requires brain some amount of continuous focus to get into. Unless you pass that threshold length of focus time, your brain won't function effectively towards the accomplishment. If you have multiple brain-involved tasks and try to work on them simultaneously by switching between them frequently, you are less likely to pass that threshold for any of them.
After realizing the mess in my "multitasking abilities", I have tried defining a unit of my focus length per task to restrict myself on a particular task for some time straight. I specify what I am going to focus on and set timer to 54 minutes which is followed up by a 6-minute break. With that set, I can measure my work by how many focus units I spent instead of hours (probably full of distractions I can't remember whatsoever).
From the initial 2 weeks of experiments, I can tell that you can finish your day well-tracked with a transparent history of your commitments.
I realize now that I should have started this much earlier, but better late than never :)
Time tracker used: Toggl Track (
https://toggl.com/)
@lazizabdullaev