If you haven't already added AMP code to your HubSpot site you need to. Now. Like, RIGHT NOW. Here's how:
Applying AMP to your entire HubSpot blog
Hop on over to your settings (the little gear icon in the top navigation) then in your Settings page click on Website > Blog. Then, click on the Google AMP tab and make sure your little on/off slider says "ON" to enable Google AMP formatted page.
That's it! Your HubSpot blog pages are now AMP enabled and ready to get that extra visibility in mobile search. What you might start seeing now is a little lightning bolt next to your mobile listings. This lightning bolt is designated for AMP content and indicates that its lightning fast (AMP = "Accelerated Mobile Pages" project).
Applying AMP to only specific blog posts
If you don't want AMP across your blog and want to only have it applied to certain blog posts, you can edit that setting in the individual blog post settings.
As of publish date (June 12, 2019) HubSpot only has AMP enablement for blog posts but hopefully we'll see AMP roll out for website pages soon as it could be a huge impact on mobile website rankings!