Fitness trackers are great for monitoring progress and build better habits, but they’re not all created equal. If you want to best, you want WHOOP. The WHOOP Strap 3.0 is a lightweight, waterproof and sleek wearable that collects 5 metrics 24/7 to give you the most accurate and granular understanding of your body. There’s also a personalized AI coach that lets you know when you need to perform or rest, how much you need to sleep and what your daily exertion level should be. It’s like having a personal trainer on your wrist for less than $1/day.