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Weight loss, built in the right order
Weight Loss · Topic 1

Why We Don't Start Your Weight Loss With Running

How we train for weight loss at BOXLAB, step by step.

BOXLAB
BOXLAB Head Coach
24 October 2026 · 5 min read · Training approach
Weight loss, built in the right order

Most weight-loss plans start the same way: run more, sweat more, push harder. We start somewhere else. Each step below comes in a fixed order, and the order is the point.

The engine comes first

Picture a 40-year-old coming back after a few years away. Day one, a few hard rounds, and his heart rate is already near the top. Five minutes later, he is done. That is not a willpower problem. His engine is simply not ready for that pace yet.

Your cardiovascular fitness is your engine. It sets how much work you can do before you tire, and the work you do is what burns the calories. A stronger engine means longer sessions, more work in every session, and faster recovery between them. That is why we build the engine first, and we build it in the right heart-rate zones.

Your endurance zones

Every zone starts from your maximum heart rate. We estimate it the way sports science labs do, with the formula 208 minus 0.7 times your age, which came out of a 2001 study in the Journal of the American College of Cardiology and has held up since. At 40, that is about 180 beats per minute. Here is what the zones look like at that age.

Blue · 50 to 60%

90 to 108 bpm

Warm-up and recovery

Easy, light effort. Where every session starts and ends.

Green · 60 to 70%

108 to 126 bpm

Where the engine is built

Your aerobic base. Most early sessions live here.

Yellow · 70 to 85%

126 to 153 bpm

Steady, harder work

Added step by step as your base builds.

Red · 85 to 100%

153 to 180 bpm

Short, planned efforts only

Kept out of the programme after a break.

These numbers are a starting point. Individual values vary, so your zones are set and checked for you in the club. Endurance athletes spend most of their training, around three quarters or more, at low intensity, because that is what builds the engine. So most of your early training stays in green, with yellow added as you adapt.

What changes in the green zone

Day 1

Same effort, red zone

Heart rate near the top

The heart works near its limit. You tire fast and stop early.

After the base

Same effort, yellow zone

Heart rate lower for the same work

The heart pumps more blood with every beat, so it needs fewer beats for the same work.

We watch this happen in the club every month. A member starts in week one, and three rounds on the pads push him straight into red. Six to eight weeks later, same rounds, same pace, and he finishes in yellow with breath to spare. Nothing about the workout changed. His heart did.

Illustration · not real data. The same workout before and after the base: the peak heart rate shifts down from red to yellow.
Illustration · not real data. The same workout before and after the base: the peak heart rate shifts down from red to yellow.

The research says the same. In the HERITAGE Family Study, one of the largest training studies ever run, more than 600 inactive adults trained for 20 weeks, and their heart rate at the same workload fell by about 11 beats per minute. That is the base doing its job. A lower heart rate for the same effort means more work before you tire, and more work is what drives weight loss.

Build the engine first.

Then add everything else.

Low impact before running

When you carry extra weight, every step lands harder. Over thousands of steps, that is a lot of load on your knees, hips and lower back.

1 to 1.5× body weight
Walking

The force through your legs with every step, measured on lab force plates.

2 to 3× body weight
Running

Two to three times your body weight, landing after landing.

0 jumps
Classic boxing

No running, no jumping. Heart rate still up.

So we do not start with running or the treadmill. We use classic boxing instead. It is a basic skill anyone can learn, it keeps the impact low, and it raises your heart rate and burns calories while you learn it.

Strength where it protects you

Trunk

Braced and steady

A strong trunk keeps your lower back steady under load.

Glutes

Take the load

Strong glutes take load off your knees and lower back.

Both are built before impact or heavier loads come in. This is the foundation everything else stands on.

Every session has a structure

01

Warm-up

Prepares your joints and raises your heart rate gradually.

02

Skill

Boxing technique, so you move well before you move fast.

03

Conditioning

Time in the right heart-rate zone for your current level.

04

Strength

Trunk, glutes and full-body work, matched to your stage.

Every drill is chosen for you, not copied from a template.

The programme moves as you do

To start

Build the base

Impact kept low

Low impact, steady zones, trunk and glutes first.

At half the extra weight lost

Add the next layer

Impact added step by step

Footwork, skipping, short runs, intervals and heavier strength work.

Nothing is added before your body is ready, and nothing stays the same once you have outgrown it. Weight loss works alongside nutrition and consistency. This is the training side of it, and the order is what makes it last.

Your first step

Every BOXLAB weight-loss programme starts with your tests in the club, so your zones and your starting point are yours, not a chart's. If you would like to see how your programme would be built, book a 15-minute Programme Discussion with a coach. Request a call back

B
BOXLAB Head Coach, BOXLAB WORKOUT
EU-qualified sports science expert and professional boxer
Next · Topic 2
Why Cardiovascular Fitness Is Weight LossSoon
The series · Training approach
  1. 01Why We Don't Start Your Weight Loss With RunningYou are here
  2. 02Why Cardiovascular Fitness Is Weight LossSoon