One page site ranking first page on Google - Are we overthinking on SEO?

I posted this in the main forum by mistake - trying to correct my error by posting here:

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Just thought I will show you an example of myths and misleading information on the internet about SEO and Google.

I tried making a one page website on bicep workouts. Google the keyphrase "bicep workouts" - (on google.com, you will find bicepworkoutsformass.info ranking 7). You might be surprised to note:

• It really is a one page site (Panda???).
• The content is not original - it contains content copied from articles.
• The site was built as a sub domain on my wordpress multisite install. I bought the .info domain and mapped it to the sub domain on my multisite.
• I did not try to build backlinks to this site. Only did some social bookmarking.
• On the single page site, I created anchor links to various sub topics within the same page to create internal linking.

The site ranks for the following keywords:

Bicep workouts - 7
bicep workouts for mass - 7
best bicep workouts for mass - 5
best bicep workout for mass - 9
bicep workout for mass - 7
bicep workout -28

I haven't checked for other keywords like best arm workouts etc.

I basically created this site to test the internal linking aspect, and let it lie. I did not want to add more content to the site etc.

Over the last 2-3 months, it has been hovering at a ranking of between 20-30, and suddenly has come to page 1 in the last one week or so.

I wonder what made google like this site suddenly.

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