Boxandbuildmattmckenna

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Founder of Box&Build - Gosforth
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11 kilos down in five months.But the numbers are not even close to being the most impressive part of Mariana's story.Mar...
19/06/2026

11 kilos down in five months.

But the numbers are not even close to being the most impressive part of Mariana's story.

Mariana is a chef working 50 plus hours a week in a high pressure kitchen.

When she started she was doing largely nothing for herself.

Mental health was not good. Physical health was not good.

And she decided enough was enough.

She got into boxing to prove something to herself.

Because where Mariana comes from, girls do not box.

In her Venezuelan culture it was almost frowned upon. Girls should not be fighting. Girls should not be doing these things.

Mariana did it anyway.

And now she is one of the most committed and hardcore boxers in this gym.

Here is where five months of backing herself took her:
-11 kilos lost
-More muscle definition than she has ever had
-Training multiple times every week without fail
-An exhibition fight already under her belt
-Another fight lined up later this year 🥊

And the part that means the most to me.

Mariana has gone from anorexia to being overweight to now being the most athletic version of herself she has ever been.

That journey is extraordinary.

She did not just change her body.

She changed her relationship with herself completely.

I could not be more proud. 🙌

📩 DM us the word "BUILD" to start building your future self.

18/06/2026

There is a moment at the end of every punch where most beginners get it wrong.

They either go completely loose or they overextend like a golf swing and lose their balance entirely.

Neither works.

What you actually want is a bit of stiffness at the point of impact. Control at the end. Not a flail.

And the key to getting that is in the feet.

When you throw the cross, pivot those right toes into the floor.

Here are the cues I use with my members:

Put out the cigarette.

Squash the bug.

Or picture those loose stones on a school playground, the ones that make that satisfying crunchy noise when you twist your foot into them.

That is exactly what your foot should be doing.

Screwing into the floor. Not swinging away from it.

Because the moment you golf swing and lift away, your balance goes.

And trying to punch someone in the face while off balance is a problem you do not want.

Stay grounded. Pivot controlled. Finish stiff.

That is how power and balance work together. 💪

📩 DM us the word "BUILD" to start building your future self.

17/06/2026

People tell me they don't have time.

Or they're too tired.

Or life is just too busy right now.

And I get it. I've been there.

But here is what boxing actually gave me, and it wasn't fitness.

It was belief in myself.

That was the one thing that was lacking.

And once that changed, everything changed.

I started showing up to work differently. With more energy. More conviction. More focus.

Because here is what half an hour of training a day actually does.

It doesn't take energy from you. It gives it back.

You turn up to your business, your relationships, your life, as a more capable version of yourself.

And the more capable you are in yourself, the more capable everything around you becomes.

But the biggest lesson boxing taught me was this.

If you want to lead, you have to go first.

You cannot stand in front of people and tell them to invest in themselves, to back themselves, to do the hard thing, if you are not doing it yourself.

That is not leadership. That is just words.

Authenticity is doing the thing you are asking others to do.

Boxing gave me that.

And it is exactly what I try to pass on to every single person who walks through these doors. 💪

📩 DM us the word "BUILD" to start building your future self.

30 kilos down in a year.But the first thing Sadia ever said to me had nothing to do with weight loss."Hey, do you help w...
16/06/2026

30 kilos down in a year.

But the first thing Sadia ever said to me had nothing to do with weight loss.
"Hey, do you help with confidence in the gym?"

That was it. That was all she wanted.

She had no interest in boxing. No interest in getting punched in the face. She just wanted to feel like she belonged in a gym and knew what she was doing.

So that is where we started.

Here is what a year of showing up delivered:
- 30 kilos lost
- Strength training she genuinely loves
- Boxing for stress relief, empowerment and fun
- Visible biceps for the first time in her life 💪
- Currently working toward her first pull up

That last one sounds small. It is not.

For Sadia, this journey went far beyond the gym.

With her background and her culture, walking into a gym, lifting weights and doing boxing was not the norm. It was not what was expected of her.

She did it anyway.

She led the way.

And I could not be more proud of what she has built, not just in her body but in herself.

That is what this place is for. 🙌

📩 DM us the word "BUILD" to start building your future self.

I'm grateful to who I was 8 years ago...I made uncomfortable decisions to push growth...Through anxiety,Imposter syndrom...
15/06/2026

I'm grateful to who I was 8 years ago...

I made uncomfortable decisions to push growth...

Through anxiety,

Imposter syndrome

Setbacks

The truth?

The only thing truly holding me back was myself.

14/06/2026

Happy Sunday 🙌

Building a tribe of legends obsessed with self improvement.

13/06/2026

This is exactly how I coach every single person who walks through the doors at Box & Build.

From day one, the goal is not to make you dependent on me.

It is to make you independent.

In your first few weeks you are absolutely allowed to look at your feet. Check your stance. Take your time. Get it right.

Because building the skill properly from the beginning is what makes everything else click later.

But after the first few weeks I want you to be able to go home, hear my voice in your head and know exactly what to do.

That crease in the trainer. That pivot. That stance.

Yours. Not mine.

Because if after four weeks you still need me to tell you every single thing, I have not coached you effectively.

Great coaching does not create dependency.

It creates confidence.

That is the standard I hold myself to with every person I work with. 💪

📩 DM us the word BUILD to start building your future self.

39 kilos down in a year.But Jen did not start training to lose weight.She started because she needed somewhere to put ev...
12/06/2026

39 kilos down in a year.

But Jen did not start training to lose weight.

She started because she needed somewhere to put everything she was carrying.

A stressful period of life. Big personal changes. A new job. A lot going on at once.

And she found that nothing cleared her head quite like lacing up the gloves and hitting the pads.

She told me that an hour of boxing and a conversation in the gym did more for her mentally than anything else she tried.

That is not something I take lightly.

Jen had never enjoyed the gym before this.

She had zero interest in fighting or getting punched in the face.

She just wanted an outlet. A release. Something that felt less like exercise and more like therapy.

And boxing gave her exactly that.

What followed was a natural progression.

The boxing gave her confidence. The confidence took her into the weights room. The training and a serious shift in her diet took care of the rest.

39 kilos. A year. And a skill level I would now describe as genuinely advanced.

All from someone who just wanted to feel better.

Here is what Jen's story proves.

You do not need to want to fight to benefit from boxing.

Sometimes you just need somewhere to go where you can work hard, clear your head and feel like yourself again.

That is what this place is here for. 💪

📩 DM us the word BUILD to start building your future self.

11/06/2026

If you are not getting the results you want from your fitness, here is an honest question.

Do you actually have these five things in place?

A clear plan of action so you are never guessing week to week.

Continuous learning so you understand the why behind what you are doing, not just following instructions blindly.

Support from someone who has already done what you are trying to do.

External accountability. Because telling yourself you will stay consistent is very different from having someone who holds you to it.

And a community that pulls you up to a higher standard than you would hold yourself to alone.
Most people have one or two of these.

The people getting life changing results have all five.

That is not a coincidence.

Write them down. Be honest about which ones are missing.

Then go and find them. 💪

📩 DM us the word BUILD to start building your future self.

10/06/2026

The cross is the most powerful punch in boxing.

And the power does not come from your arm.

It comes from the ground up.

Pivot the toes. Drive through the knee. Hip comes through. Shoulder follows. Arm extends last.

Think about twisting your foot into the floor, squashing something under your heel as you rotate.

That rotation through the whole body is where the real power is generated.

If you just extend the arm, no matter how big you are, it will not hit anywhere near as hard as a smaller person who uses their whole body correctly.

Here is the key thing most beginners miss.

You need a crease in your trainer at the point of pivoting.

If you come all the way up on your tiptoes you lose your base, your balance goes, and the punch loses everything behind it.

Stay grounded. Rotate fully. Let the body do the work.

That is the difference between a punch that stings and one that changes the fight. 💪

📩 DM us the word BUILD to start building your future self.

Address

169-171 High Street
Gosforth
NE31DB

Opening Hours

Monday 7:30am - 8pm
Tuesday 7:30am - 8pm
Wednesday 7:30am - 8pm
Thursday 7:30am - 8pm
Friday 7:30am - 8pm
Saturday 7:30am - 12pm

Telephone

+447443412698

Website

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