top of page

Metabolic Testing for Sportsmen and Women

Box Endure removes the guesswork from your training and nutrition with metabolic testing, enabling us to build a plan around you and your physiology.


Box Endure provides VO2Max, submax and lactate testing in Birmingham (UK) to help support your nutrition and training so you can continue to monitor your performance, training effectiveness and target your nutrition and exercise based on your physiology.

perform better.
look better.
feel better.

Are you struggling with how to fuel yourself correctly

Are you training with the correct intensities based on your physiology?

Are you finding it difficult to balance eating to perform and lose body fat?

Are you regularly testing to see if your training is effective?

Are you unsure about what to eat to get the most from your training, recover more quickly and look your best?

This is how Box Endure can help.

On a Run


Combining elite level testing with year round support, our testing helps remove the guesswork from your training and nutrition, and provide you with a targeted plan that gets results.

Whether you’re a runner, cyclist, adventure athlete or triathlete, we can help.

What's involved.....

Box Nutrition brings elite testing to the recreational, amateur and age-group athlete


By using state of the art equipment and methods, VO2Max testing and lactate profiling enables us to analyse your data and provide you with the most accurate nutrition and training recommendations completely bespoke to your individual requirements.


It also enables us to pinpoint your training zones (how hard to push) and highlight how to fuel your sessions and any races.

VO2max and submax testing

Your VO2Max is one of the best markers for fitness and performance. Although not the only metric that matters (The Five Fundamentals Of Endurance Performance), your VO2Max represents the ceiling of how much oxygen you can breathe in and convert to energy. The more energy you can convert, the more power and speed you can produce. VO2Max and submax testing is also used to discover your aerobic/lactate threshold 1 and anaerobic/lactate threshold 2 and metabolic efficiency (fat burning).

As well as being a measure for fitness, VO2Max testing provides you with much more than just this.

Training Zones

Based on your VO2Max or submax test, we can accurately pinpoint your training zones (not the max heart rate nonsense), which enables you to target your training to achieve a specific outcome. This means you know what heart rate, power or speed you should be aiming for within each session.

INSCYD Testing .jpg
On a Run
Identify your strengths and weaknesses

From your VO2  test, we are able to understand how you stack up, which gives us a better understanding of where you need to improve. Is it your based endurance, high intensity exercise, or do you need to be more efficient?

Carb Vs. Fat Burn

Testing enables us to see your kcal burn as well as how much fat and carbohydrates you burn at different intensities (speed or power). Your carbohydrate/fat burn helps us understand how to fuel various training sessions as well as how to maximise fat loss.

The long form VO2 test (metabolic efficiency) is best to establish a clear picture of your carb:fat burning.

Fat burn

If you are a serious endurance athlete, you may wish to opt for a lactate profile which helps us identify your lactate threshold. Combining this with a VO2Max can help cement your training zones. This is a longer step step test than the typical VO2Max test, which involves drawing a small blood sample between stages.

Test Your Body Composition

Using the premier body composition analyser, the InBody 270, we measure how much lean mass you have in each body segment, as well as segmental fat and visceral fat analysis. This helps us accurately determine your protein and carbohydrate needs.

Who is Box Endure for?

Box Endure is for competitive or recreational athletes who are looking to maximise their training and performance.

Whether you're a runner, cyclist, CrossFitter, footballer, triathlete, adventure racer and looking for those marginal gains, Endure can provide you with the tools to direction to take your training and results to the next level.

INSCYD Testing .jpg

How Does It Work

RMR test_edited.jpg

Test Your Metabolism

From a simple RMR (resting metabolic rate test) we can measure exactly how many kcals you burn at rest. From this we can provide you with the number of kcals (how much food) you need to help with both fat loss and fuelling.

The metabolism test is a simple test, which involves you sitting down and relaxing for 20mins. You breath into a mouth piece and using a metabolic cart, we measure the oxygen that you’re breathing in and the carbon dioxide that you’re breathing out. This ratio helps us determine how many kcals you burn at rest. This is called indirect calorimetry.

pick your package

Box Endure is designed to build testing around your needs. Choose from the following package or, we can help customise a package for you if you send us a message to or call us at 07860945336

endure anchor
Jack Braniff.jpg

My name is Jack Braniff and I help athletes perform, look and feel their best. I'm the founder of Box Nutrition and a registered performance nutritionist (SENr, CISSN), have my Masters degree (MSc) in Sports and Exercise nutrition, a member of the British Dietetics Association and a UKAD anti doping advisor. I'm also the author of the sports nutrition book "Fuelling The Functional Athlete" .

Although specialising in nutrition, I'm a certified VDOT running coach, INSCYD practitioner and completed the Endure IQ fundamentals of long distance triathlon programming giving me a solid insight into endurance training and programming.


Jack Braniff MSc


Find us.

Friendly settings.

We are situated the between Wylde Green and Erdington in Birmingham (B24 0DE), just 10-15mins walk from Wylde Green Station. We also operate from the Club and Spa in Birmingham city centre. 


Before any testing, we have a quick 15mins consultation This is just a quick chat to get to know you, understand your goals and go through what to expect during testing.

After your consultation, your metabolic testing will be conducted. You will then receive your results within 48hrs.

bottom of page