The Apple Watch Ultra 4 is a large, sturdy smartwatch that lets you track your sports activities. The robust titanium case is scratch-resistant and waterproof. This means you can keep your Watch on during running, trail running, and even deep sea diving. On the large 49mm screen, you can check your heart rate, speed, or your route, for example. Thanks to the ECG heart rate sensor and saturation monitor, you can measure your heart rate and oxygen level accurately. The watch is fairly large and heavy. Consider if this suits your wrist and choose the right strap when you purchase your Apple Watch Ultra 4.