Swimming is a fantastic low-impact activity that can help you improve your health and wellness while also helping you relax thanks to the natural effects of being in the water. Water provides buoyancy but adds resistance, so it is light on your joints and helps you stretch and improve your flexibility. One way to monitor your exercise activity in the water is with a waterproof smartwatch, and there are plenty of options available to buy today. At ZDNET, we’ve tested all of the best smartwatches on the market, evaluating factors like the ability to function while submerged in water, heart rate accuracy in the water, battery life, smart features, and more. Also: The best Apple Watches we’ve testedAll of the watches in this list have at least a certification for 5 ATM and/or an IPX8 rating. ATM stands for atmosphere, and to be 5 ATM means that the watch can withstand pressure equivalent to 50 meters/164 feet. Lower ratings can withstand some water exposure, but the pressure associated with swimming means a 5 ATM rating is the minimum recommended for this activity. What is the best waterproof smartwatch right now? Based on both our hands-on testing and insights from experts, we named the Apple Watch Ultra 2 More