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WHOOP Introduces Strength Trainer; Becomes First Wearable to Measure Muscular Load

Innovative Feature Provides New Insights on Muscular Load for a More Comprehensive Strain Score

BOSTON (April 25, 2023)WHOOP, the human performance company, today announced the launch of Strength Trainer, a new feature that allows members to measure strength training exercises and quantify the physiological impact of muscular load. With this launch, WHOOP 4.0 becomes the first and only wearable to measure how strength training impacts the body. This all-new feature tracks exercises, reps, and weight usage to quantify muscular load, using the accelerometer and gyroscope sensors to calculate the strain that’s put on the musculoskeletal system. That muscular load is now factored into the WHOOP Strain score to provide a more comprehensive and advanced view of the demands placed on the body. 

“For years, WHOOP has researched and developed technology that can quantify the impact of weightlifting on the human body,” said Will Ahmed, Founder and CEO of WHOOP. “Strength Trainer represents a new frontier for WHOOP to measure muscular load. We are proud to be first to market and release a feature that helps coach our members while strength training.”  


Strength Trainer is a major innovation in the wearables category which has struggled to effectively capture the impact of strength training on the body. Other wearables only track the load on the cardiovascular system during exercises that elevate heart rate — however, weightlifting predominantly stresses muscles, bones, joints, and tissues, not the heart. Weightlifting systems may track what you lifted based on a 1-rep max model, but fail to identify the cumulative stress put on the body. Strength Trainer provides a first-of-its-kind approach to quantifying the cumulative impact of a strength workout’s impact on the musculoskeletal system. Muscular load quantifies the response of muscles, bones, joints, and tissues based on the volume and intensity of training, using unique movement profiles for every exercise to account for the different percentage of the musculoskeletal system used.

With Strength Trainer, members can create custom routines from a library of more than 200 exercises, or they can select pre-built workouts from WHOOP athletes Michael Phelps, Patrick Mahomes, Rory McIlroy, Colleen Quigley, and Sloane Stephens. The WHOOP Strength Trainer also offers exercise demonstrations, superset capabilities, and drag-and-drop features. After a workout, members can access a detailed view of their performance, allowing them to optimize their fitness regimen and achieve their goals. 


WHOOP Strength Trainer addresses a critical gap in the industry by providing the ability to quantify both cardiovascular and muscular load. This feature is unparalleled in the market, ensuring that members can train optimally.

The addition of Strength Trainer comes on the heels of another revolutionary update to the WHOOP app - Stress Monitor. Through these two new features, WHOOP is continuing to lead the way in innovation in the wearable technology space to create a more well-rounded and complete wellness experience for its members. 

Strength Trainer is now available in the WHOOP app and more information is available at: To make it even more convenient than ever before to access WHOOP, it is now available for purchase on, as well as at Best Buy, Dick’s Sporting Goods and


WHOOP, the human performance company, offers a wearable health and fitness coach to help people achieve their goals. The WHOOP membership provides best-in-class wearable technology, actionable feedback, and recommendations across recovery, sleep, training, and health. WHOOP serves professional athletes, Fortune 500 CEOs, executives, fitness enthusiasts, military personnel, frontline workers, and anyone looking to improve their performance. WHOOP Unite is a comprehensive solution dedicated to supporting organizations across a wide range of industries with coaching, organizational insights, and health programs. Studies show WHOOP can positively change behavior, increase sleep, and improve physiological biomarkers. Founded in 2012, WHOOP is based in Boston and has raised more than $400 million in venture capital. The latest round of financing made WHOOP the world's most valuable standalone wearables company. Visit for more information and connect with WHOOP on Instagram, Twitter, Facebook, LinkedIn, and YouTube.