Ranking on Google's First Page...

You need to target keywords which can't be related to geographical locations. Terms such as "boxing classes" are too generic and you need to dig deeper and find longtail keywords which can't trigger a local search or change your keyword alltogether.

When I Google "boxing drills" I don't get any location-specific search results and only see information-based ones. Even then, "boxing drills" may be too competitive for you and you will need to find a longtail keyword for that term that is easier to rank for.

You also need to avoid keywords which trigger certain results such as:

Results with Google's Knowledge Graph (typing in Thomas Jefferson will show information about him on the side)
Results with featured snippets (e.g., how to tie a tie shows a snippet with these directions)
Results with authority sites that are targeting your exact keyword (though there are exceptions)
Results with Google's “In The News” feature, unless you have a news site.
Results with local results at the top of SERPs, unless you have a local business and you plan on ranking in the local 3 pack.
Results with more than 1 of the above.

Are you searching for those keywords in the normal browser in which you do all the stuffs if yes they those results will be little odd.
I would suggest you to use an incognito browser and if you are looking to check results for US then hit google.com/ncr and then search for those keywords.
Or you can use some keyword research tools like kwfinder or ferzy.com to check the serp results.
After that prepare a plan to rank above them.

Ranking on google is always depend on onpage seo and off page seo. Onpage seo is full of based on website structure towards google algorthim.

Try to use the right keyword for doing SEO for it, then start promoting your website along with it at Good and High PR sites so that you will find your website in rank after searching for that particular keyword.

Look at how Yelp.com does it.

Phenomix has it right. Target online specific phrases like "learn boxing online" or "online boxing classes/lesson". Create how-to videos, write how-to articles.

If you want to rank high on Google, you must build quality backlinks. It seem as school, no one know you are good if you do not have recommendation from teachers .

Search boxing lessons online than scroll down to the bottom of the results.
G will show you some other kw suggestions.
Search those and see if G gives more kw suggestions.

Ranking on Google's SERPs will require time to be establish on high rank and it needs consistency of the website's relationship to the users in which tells the search engine that your site is a good source.

get some more relevant keywords, which is helpful to get ranking in the google.
Try google keyword planner.

Understand your market - National, local or international. Select the right keywords (geo targetted, medium competition, good searches), optimize your website (on page, content) and start creating links and social media.

We cannot grantee anything in SEO, just try best practices. It need time to get noticed using organic SEO services.