Personal trainer · Walthamstow, East London & online

Training the body. Rewiring habits.

One-to-one personal training in a private Walthamstow gym, with the nutrition and behaviour change coaching that helps it stick.

Get a Free Consultation Find your starting point

  • 20+ years as a personal trainer
  • BSc Nutrition & Exercise Science
  • Private gym in Walthamstow

Why lasting change is so difficult

Most people don't struggle because they don't know what to do.

They struggle because life gets busy. Motivation comes and goes. Old habits creep back in. The programme that felt exciting in week one becomes difficult to maintain by week six.

That's why so many people find themselves starting over again and again.

The answer usually isn't another diet, another training programme or another burst of motivation. It's building consistency.

  1. Start
  2. Week one feels exciting
  3. Life gets busy
  4. Motivation fades
  5. Stop
and again

Find your starting point

Two questions. Thirty seconds.

Tell me what tends to get in the way, and I'll point you to the kind of support that fits. You don't have to choose anything yet.

1 of 2

What usually knocks you off course?

Awareness gives you the grip. Behaviour makes the move.

Mack Parnell smiling, sitting on a log in Lloyd Park, Walthamstow

Meet Mack

A personal trainer who got curious about why plans don't stick

I'm a qualified Personal Trainer with a degree in Nutrition & Exercise Science. Over the years I've helped people improve their fitness, health and confidence, but one lesson kept appearing: information alone rarely creates lasting change.

That's what led me to explore behaviour, habits and the psychology behind consistency. I'm still a personal trainer first, but food and habits are where most people get stuck, so helping with those is now part of how I coach.

More about me

What happens next

A relaxed conversation, not a sales pitch

  1. Get in touch

    A short message is enough. You don't need to know which service you need.

  2. Free consultation

    By phone or Zoom. Ask questions, explain what you'd like to improve and see whether the way I work feels right for you.

  3. Start from where you are

    If we decide to work together, I'll explain the next practical step before anything is booked or paid for.

Books · Coming soon

Being Out of Your Mind

You don't control the thought. You control what you do next.

Writing has allowed me to explore the ideas behind behaviour change in greater depth, and those same principles influence the way I coach today.

About the book

Being Out of Your Mind, a forthcoming book by Mack Parnell
A woodland path running between tall pine trees

Ready to build lasting change?

Whether you're looking for personal training in Walthamstow or online coaching from anywhere in the world, I'd love to hear about your goals.

Let's start with a relaxed, no-obligation conversation and see if we're the right fit.

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