Honest first impressions...
I had no idea what your site 'sells', I didn't even see the 'In-depth Interviews with the Best in Fitness' in the header image until a few minutes later, a point where most users will have decided to leave or stay already.
In terms of content, it basically feels more like a blog but the layout doesn't really suit that sort of vibe, it does kind of come across as one of those sites where it's 'get fit in six weeks' and for me I think the reason is that it's the amount of content on the front page, there's no 'most recent' article(s), they're all just lumped in a 'gallery' format.
It does need more 'calls to action' even for things like getting people to click on other subsections, in their current position they're a bit lost. If it was me I'd move them down under the 'title image' and make them a bit more prominent. I'd also question some of the terms given to sections, when I went to 'groups' I was expecting a forum or a directory type of thing, not just another index of what's on your site.
If I was changing it I would add in more information about the aim of the site, maybe even add a proper home page with most recent articles, bolder links to the sub topics etc. This same home page can make things more evident like social media and contacting you, I didn't even know they were available until I clicked on the about page...
In terms of overall aesthetics, it just seems a little flat, it's lacking any character and as much as I like minimalist design, I'd argue it's too minimal. I will say I like the lack of adverts, that always gets a thumbs up from me, if you do decide to do adverts on the site, maybe consider sponsored content rather than 'ads' on the page

Just a side note type of thing about the design, I'm using a 16:9 1080p display and honestly it felt incredibly narrow and felt like something was missing on the page due to the relatively huge borders, so it might be worth looking at your page layout or how scales on wider screens, especially considering there will be some out there with 21:9 or 4k displays (doesn't seem to scale with screen res) now.
As to the term hackers, I'm neither here nor there on it, I know that hackers have a negative connotation in certain environments but I'm also used to hearing the term hacks as a way to say 'speed this up' or in game design where dev hacks are used while testing.