stu.mullen

stu mullen

Hybrid athlete.
Business owner.
Dog dad.

Runner, HYROX racer, business owner. Author of Protect My WP.

Stu Mullen running the Saucony London 10K in 2025

## about

I'm Stu. I live in the UK with my wife and our fox red Labrador, Darcey. She's five, and we walk her a lot.

The thing I'm most passionate about is health and fitness. My focus is HYROX and road running, with strength training to support both. I love HYROX because it asks for everything at once, strength and endurance and the kind of mindset that turns up when none of those feel available. The events help too. Dubstep & drum and bass at full volume while you push a sled is, it turns out, exactly my kind of thing. I share what I'm doing as hybridfitnessguy on YouTube, TikTok and Instagram.

The day job is Serenity Digital, which I co-founded in 2012. It's a marketing consultancy of fifteen, doing creative, technical and growth work. My background is web development and sysadmin, so I'm at home in a terminal, and I've put that to work on a side project too: Protect My WP, a practical handbook for keeping a WordPress site safe, fast and up to date. Most of my spare thinking these days goes on AI. I use it day to day, build with it, and lean on it for data analysis. It's the most interesting thing happening in tech in years and I'd rather be using it than reading about it.

## work

Serenity Digital

Co-founded in 2012. A marketing consultancy offering creative, technical and growth services to organisations that want plain advice from people who care.

Protect My WP

The WordPress administrator's security handbook. Thirteen chapters on hardening, hosting, performance and maintenance, written for agencies, freelancers and anyone who looks after a WordPress site. £19, one payment, lifetime access.

## writing

A couple of long reviews from a while back. Still useful, still my honest take.

## contact

Drop me a line. Goes straight to my inbox.

elsewhere