What's your fit score?

From grip strength to bone density, Jess Salter tests the wellness services that offer data about your hidden health concerns

It was when I stepped into the Neko scan, dressed only in a stylish Hay gown, and a disembodied voice told me it was processing thousands of images of my body that I felt like I'd entered the future of wellness. Soon after a nurse hooked me up to ECG monitors to test my heart and a device that measured my grip strength - the new 'It' biomarker.

Longevity is the buzzword on the wellness scene. It has 1.8m posts on Instagram and the global longevity market is projected to reach £34.4bn by 2030, according to analysts. I'm already a fully signed-up obsessive.

Having recently turned 40, I embarked on a full range of 'under the bonnet' tests. I'm no Bryan Johnston, the biohacker whose Netflix show is called Don't Die: The Man Who Wants To Live Forever. I don't want to live forever (it sounds kind of boring), but I want to live well for my remaining years.

Along with Neko, which has a 100,000 person waiting list, I have had my DNA analysed (to measure levels of toxicity in my body, liver health and neurotransmitter health), had full blood tests (which revealed chronic magnesium deficiency, the root of my now-solved insomnia), checked out my metabolic age (the humble brag du jour, that even made it on to an episode of The White Lotus) and I'm signed up for the full body MRI scan, Prenuvo, which boasts Kim Kardashian and Gwyneth Paltrow as clients. I'm going big. Forget that dusty set of bathroom weighing scales, 2025 is all about getting to grips with the biomarkers of the moment.

'For women in their twenties to forties, understanding key biomarkers is essential for long-term health and disease prevention, says Dr Mohammed Enayat, founder of the longevity clinic HUM2N. He adds, 'By proactively testing, women can take control of their health, identify risks early and implement changes to improve longevity and quality of life?

Some critics worry that over-testing can lead to health anxiety: for me, it's reassur-ing. The bigger complaint is the cost - these tests are expensive. But Enayat, who is also a practising GP, believes that, some day, they could become the future of healthcare for all. For now, I'm happy to be a guinea pig - finding out about my own health while perhaps participating in an altogether bigger experiment.

Grip strength

How tightly you can grip something is, according to a study published in The Lancet, a marker of much more than muscle strength. 'It reflects overall vitality and re-silience, says Dr Sam Rodgers, lead GP at Neko Health. 'Research has shown that high grip strength is associated with a lower risk of cardiovascular disease, as well as metabolic and cognitive health?

HOW TO TEST IT: Neko Body Scan, £300, nekohealth.com. This gives your grip strength readings context - it's measured alongside a myriad of other data points in one 60-minute appointment.

Metabolic age

The go-to-brag at the moment is how young you are metabolically - especially if you've shaved years off your chronological (actual) age. It's a blood test that checks the levels of your cholesterol, HbA1c (diabetes risk) and inflammation. It's interesting because it can offer insights into your overall health, fitness level and how efficiently your body burns calories. Some tests can also look at the age of your individual organs and blood - scientists are discovering they age at different rates.

HOW TO TEST IT: Selph Metabolic Age Blood Test, £89, selph.co.uk, comes with a doctor's report.

Omega-3 index

'Your levels of omega-3 can indicate how, much silent inflammation you have in your body', says Bethany Hughes, registered nutritional therapist and co-founder of The Remedy Nutrition Clinic. 'Women need different levels of different types of omega-3s at different stages of life (from puberty to prenatal to perimenopause). Results can speak to your risk of heart disease and cognitive decline. You can balance your omega-3 levels through dietary changes and supplements'.

HOW TO TEST IT: Omega-3 Index Report, L180, remedy-clinic.com

Bone density

Throw out the scales and ignore the BMI, which can be hugely inaccurate for many ethnicities, along with anyone who lifts weights. The best way to work out your body composition is via a Dexa scan, an X-ray that measures your body's fat, muscle and bone composition. The scan can give indications about likelihood of developing osteoporosis later in life, as well as whether your body is carrying excess fat.

HOW TO TEST IT: Dexa Scan, widely available and costs between £150 and £250, depending on provider.

Gut health

Gut health is the foundation of overall wellbeing and one major factor is intestinal permeability, known as leaky gut. 'Leaky gut has been linked to more than 80-90% of autoimmune conditions, as well as diabe-tes, liver disease and chronic inflammation', says Enayat. 'A test measures markers that indicate the integrity of the gut lining, as well as inflammatory endotoxins'. Stellar results? A sturdy gut lining is something to brag about. Room for improvement? Most tests follow up with a nutritional consultation and diet-based road map - time to show your gut the TLC it deserves.

HOW TO TEST IT: Gut Barrier Panel Test, £295, shop.hum2n.com, followed by an online consultation to create a personalised nutrition and supplement plan.

Hearing test

You're never too young for a hearing test. More than 18 million adults suffer from hearing loss, according to the RNID - and research shows that untreated hearing loss can lead to health problems, including an increased risk of developing dementia, according to the Alzheimer's Society.

HOW TO TEST IT: Use your AirPods Pro 2, £299, apple.com. You can do a clinical grade hearing test on your AirPods2, which gives instant results and information regarding any next steps, including how to use your Pods as a hearing aid.