“As a runner, I appreciate all of the additional data points I’m gathering during each run, and I love that I’m able to track my workouts, sleep, health, texts, music, and everything else, all from a single device,” Amy Eisinger, MA, CPT, said in her Ultra review. It got a makeover with a ruggedized titanium case, larger digital crown, and the addition of buttons (so you don’t have to fumble with the touchscreen mid-workout). The Ultra looks entirely different from past Apple Watch models. When the Apple Watch Ultra launched last year, there seemed to be two opposing reactions from athletes: immediate obsession or overall skepticism.

Subscription: Required membership ($239/year) Water resistance: Up to 10 meters for two hours The brand also now offers clothing and accessories that let you position the tracker on different parts of your body (including your chest), so you can find the most comfortable option for you. Marcel Dinkins, CSCS, personal trainer and Peloton fitness instructor in NYC, tells SELF that Whoop has helped her “learn to properly stagger workouts, to take advantage of scheduling naps, and really prioritize proper recovery in between sessions so I can continue to go hard when it’s time to train.” Another cool fitness feature is Whoop Live: You can overlay your Whoop data onto a photo or video, which is a fun way to share your workouts with friends, on social media, or just to keep a visual log of your routines. That number helps her decide how vigorously to exercise each day-or when to rest instead. The tracker calls this metric Strain Coach, which takes into account heart rate variability (HRV), resting heart rate (RHR), and hours of sleep. Strength coach Ava Fagin, CSCS, director of sports performance at Cleveland State University, wears hers 24/7 to keep tabs on her sleep and recovery score.

A number of top athletes like Michael Phelps and LeBron James use Whoop, a tracker that focuses on an oft-forgotten part of training: recovery.

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