Pace3 maximum oxygen uptake refers to the maximum oxygen uptake of the body under the maximum exercise load, which is one of the important indexes to evaluate the aerobic exercise ability of the human body. When doing aerobic exercise, the body should take in oxygen to provide energy. The higher the maximum oxygen intake, the higher the efficiency of oxygen intake, and the better the exercise ability and endurance. The "health" App on the watch can monitor and analyze the user's exercise data through the built-in sensor, and get the maximum oxygen uptake value of pace3. Users can improve their maximum oxygen uptake through different exercise modes and intensities to achieve better health effects.