For years, women have been asked to listen to their bodies. Yet they have also been given remarkably few tools to understand what those bodies are actually saying.

Even today, much of medical research, sports science, and wellness technology remains built on male data sets, male baselines, and male assumptions. Which is why speaking with Dr. Kristen Holmes, Global Head of Human Performance, Principal Scientist in Performance Science at WHOOP, feels like sitting with someone quietly rewriting the rulebook on women’s health.

Her work is not just about better data; it is about finally closing a knowledge gap that has shaped women’s wellbeing for generations. Holmes’s journey into performance science began long before she teamed up with the wearable health tech company WHOOP, which has become something of a cultural phenomenon of late. “I was building my own technology at Princeton University,” she recalls, describing the early days of tracking athletes beyond the walls of the training centre. She was not simply coaching her teams to championships, she was trying to understand the fundamental mystery every woman knows too well: “Why am I ready some days and not ready other days?”

As she tells it, peak performance has never been determined solely by what happens in the gym. “It’s actually the other 21 hours of the day that are more reflective of how you’re going to show up.” That intuitive truth, one women have always lived, of juggling ambition, caregiving, and invisible labour, became her scientific north star. When she met WHOOP founder Will Ahmed a decade ago, “he offered me a job, and I ended up joining forces.” She brought the research; WHOOP brought the hardware; and her expertise helped to build a platform that would help millions decode the physiology behind wellbeing.

That mission took a sharp turn toward women’s health in 2017, when a researcher approached Holmes about conducting a pregnancy study. Holmes quietly began “doing all this female research, almost like in the shadows,” she remembers. A breakthrough moment came when WHOOP captured physiological signatures predicting birth timing across pregnancies: “In all the pregnancies, there was an inflection point. A massive bump in HRV and a massive decrease in resting heart rate.” It was the beginning of a scientific correction long overdue. Holmes insisted future WHOOP research include women in equal numbers. “Every single research study that we do is going to have as many women as it does men,” she says. Today, her work spans menstrual cycles, exercise physiology, perimenopause, menopause, and female longevity with researchers from Stanford, North Carolina, and beyond. “We’re really zooming out and asking: what are the baseline characteristics? It just doesn’t exist.”

At its core, Holmes’s approach is deeply empowering. She believes women deserve data that make their choices clearer, their effort more intentional, and their performance more predictable. “Your physiology impacts your psychology and vice versa,” she says. “If you understand how to apply your effort, performance becomes more of a choice.” That insight feels particularly poignant in a region where women are increasingly embracing biohacking, strength training, and longevity science. For Holmes, the fundamentals begin with strength. “Women should be lifting weights across their lifespan,” she says unequivocally. Cardio alone won’t do it. “If you’re under-muscled… that’s when problems arise.” Weight training improves metabolic health, glucose uptake, and hormonal stability, all critical for women navigating perimenopause and beyond.

Just as important? VO2 max training. “If I were to do nothing else, those two pieces are absolutely fundamental for women.” She brings the same clarity to sleep, perhaps the most underestimated pillar of women’s wellbeing. “Modern life is set up to be quite destructive,” she warns. Our detachment from natural light cycles, food timing, and consistent sleep-wake rhythms comes at a physiological cost. “Sleep consistency is what drives quality sleep,” she explains. Yet WHOOP’s data shows women in the region are struggling: “This region is not good, it averages a 61% sleep consistency.” The goal is above 80%. “You’re really reducing the risk of illness and disease if you can hit that number.”

Holmes believes most sleep problems start not at night, but first thing in the morning. “People don’t understand how to get into that consistent sleep/wake time,” she says. The solution is deceptively simple: “If you stabilise your wake time, and get a hit of natural light right away… that signal is so vital.” The body’s internal clock needs that cue to know when to power up, and when to wind down. Without it, even the most disciplined evening routine collapses.

But perhaps Holmes’s most compelling work lies in the future-facing frontier of precision health. She lights up when discussing WHOOP’s new integration of blood biomarkers with the WHOOP Advanced Labs feature. “Combining blood biomarkers and longitudinal physiological data is so exciting to me,” she says. “There’s nothing more precise than the marriage of these two components.” For the first time, the entirety of a woman’s internal landscape, from sleep, stress, and hormones, all the way to training, recovery, and micronutrient status, can be understood as a single, interconnected system.

WHOOP is building what the WHOOP team calls “the health OS,” a personal operating system that helps women course-correct before symptoms become crises. “We just literally don’t have to guess as much,” she says. “You’ll know within a couple weeks where you need to focus your effort.” It is a revolutionary idea: that women’s bodies, long overlooked in research and misunderstood in medicine, can finally be monitored with nuance and acted on with confidence. The emotional impact of this work is not lost on her. She shares the story of a man who charted his recovery from depression through WHOOP’s HRV data. “It makes me emotional,” she says quietly. “Your HRV is so strongly correlated with your psychological functioning.” For women, whose mental health often shifts with hormonal cycles, life stressors, and caregiving responsibilities, this kind of real-time visibility is transformative.

Currently, Holmes is hard at work completing her first book, Aligned. “It marries the physiology and the psychology,” she says, describing a body of work shaped by decades of research, and lived experience. Writing it has been “torture,” she admits with a laugh, but also necessary. “We are at an unprecedented time in human history,” she says. “Why wait until you’re on the razor’s edge of a health crisis? Every day you can have insight into how you’re travelling through life, so you can course-correct as you go.” And that, perhaps, is the quiet revolution she is leading: not just helping women live longer, but helping them live better. So that women can live on their own terms, with their own data, and with a clarity the world has denied them for too long.

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Images: Supplied & Feature Image: @drkristenholmes