I own a Samsung Galaxy Watch 4, and bar a brief hiatus from my wrist late last year, I’ve been using it since its launch in 2021. While it’s starting to show its age and newer Galaxy Watches have certainly surpassed it in terms of specifications, the newer health-focused features of its successors haven’t tempted me to upgrade. In fact, despite it being five years old and four generations behind, there’s one Galaxy Watch 4 feature that still hasn’t been topped: the body composition monitor. Introduced with the Galaxy Watch 4, the body composition feature is completely unique in the smartwatch world and is available on every Galaxy Watch launched since. It uses the Bioelectrical Impedance Analysis (BIA) sensor to estimate the amount of body fat, muscle, and water in your body. It does this by sending a weak electrical signal through the wearer, who completes the circuit by resting two fingers on the watch’s two buttons. The watch then reads the resistance caused by the bones, muscles, and fat in the body to calculate the overall composition.