Are you a sportyn active person?

Both 'sport' or 'active' would work in here, but the rest of the passage seems to be talking about activity in general, and not necessarily playing a sport.

Three years ago I proposchallenged myself, as a New Year's resolution, to practice a sport every day of the year.

'Challenged' instead of 'proposed' is a stylistic choice, as proposed would technically make sense, but this makes it sound more natural. 'To' and 'a' have also been inserted to sound more natural.

I've been always abeen quite an active guy, but that first year was a massive change.

I created a Google spreadsheet to write downtrack my progress and that first year I worked out around 90% of the days in the year.

The word 'track' would be more accurate for assessing progress, rather than the less specific 'write down'.

I got the idea of registering all my exercise days from an article about achievebuilding good habits in your life.

It claimed that it's though for the brain to "cut chains", so when you start to accumulate in the diary several days in a row exercised the brain resist to breakee several days in a row in the diary, the brain is better at maintaining the streak and itwhich helps to createbuild the habit.

As far as I am concerned, after three years I can undoubtedly say ¡it works!.

I've been always been a quite an active guy but that first year was a massive change.

I got the idea of registering all my exercise days from an article about achieveing good habits in your life.