Andy Devaney
Dame Jessica Ennis-Hill is taking on perimenopause with the same intent she once took to the start line. Through her Jennis app, Dame Jessica Ennis-Hill is launching a science-led perimenopause program designed to stop women feeling blindsided by a decade of hormonal chaos. Instead of guessing their way through symptoms, users get data-driven coaching, strength-focused training and clear, no-nonsense guidance for one of the most underserved stages in women’s health.
As the Olympic champion turned femtech trailblazer puts it, Jennis has always been about empowering women with the sort of physiological know-how traditionally reserved for elite athletes.
Now she’s extending that mission into perimenopause, a transition that can stretch up to a decade and often leaves women feeling blindsided.
Jennis, already a leader in hormone health intelligence, built its reputation by helping women understand how their menstrual cycles can drive performance. This new program widens the lens, offering personalised insights, movement guidance and symptom support tailored specifically to the hormonal rollercoaster that perimenopause brings.
At the core is the platform’s Hormone AI model—technology sharp enough to spot the shifts women feel long before they can name them. It powers the in-app coaching, daily advice and strength-led routines created to counter the biological changes women face as estrogen drops. The aim is simple: rebuild strength, steady mood, support metabolism and keep women moving with intent instead of exhaustion.
The physical shifts are only half the story. Many women say perimenopause brings confusion, irritability, hot flushes, anxiety and a sense of feeling disconnected from their own bodies. Jennis tackles this head-on with guided yoga, breathwork sessions, symptom-support modules and practical lifestyle interventions that don’t require a biology degree—or endless Googling at 2 am.
And because understanding the body starts with actually seeing what’s happening inside it, the app includes a personal dashboard that tracks activity, symptoms and menstrual health trends. It pulls sleep, stress, movement and lifestyle factors into one place so women can finally spot patterns they’ve been trying to piece together in their heads for years. When needed, it also arms them with the clarity to walk into a doctor’s appointment and actually feel heard.
To make the science digestible, a team of physiologists, nutritionists, strength coaches and hormone specialists offer “micro-casts”—quick-fire, 5–10-minute audio explainers answering the questions women rarely get straight answers to. These little nuggets cut through the noise and give women a grip on what’s happening under the hood.
The program lands at a time when the health and fitness world is only just beginning to acknowledge the vast gender data gap. Shockingly, only 8% of research studies are conducted exclusively on women, leaving most of the fitness guidance women receive based on male physiology. Jennis was built to correct that imbalance—mapping hormone patterns across puberty, fertility, pregnancy, perimenopause, menopause and beyond.
Under the leadership of Dame Jessica Ennis-Hill, the brand leans on the sort of methodology sports scientists use to support Olympic athletes. Through CycleMapping—developed with women’s health physiologist Dr Emma Ross and elite sports experts—the app turns complex hormone science into accessible training, nutrition and recovery advice tailored to each woman’s monthly rhythm.
The results speak for themselves. In partnership with Mint Diagnostics, Jennis ran its Hormonix study to test the impact of adapting training to the four menstrual phases. More than 70% of participants reported fewer negative symptoms. Over half felt more motivated, more active and more balanced throughout the month. It confirmed what women have suspected for decades: the menstrual cycle is a vital sign, not an afterthought.
Now, with the new perimenopause program live, Jennis has widened the playing field again—this time for women who’ve spent too long without a proper playbook for this stage of life. It’s a bold attempt to ensure that whether a woman is 25, 45 or 55, she isn’t left guessing about her own physiology.
With Dame Jessica Ennis-Hill at the helm, Jennis is betting on a future where women understand their hormone patterns as instinctively as they check their step count—and where every woman can train, recover and live with the same strategic insight elite athletes take for granted.
Find out more via the Jennis Website Here:
