Smart Rings

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SMART RINGS - TRACK YOUR BODY DATA 24/7

A smart ring provides health and recovery data around the clock – without a screen, notifications, or a watch on your wrist at night. Gain insights into sleep, resting heart rate, HRV, oxygen saturation, and body temperature in a discreet ring you barely notice.

The perfect supplement to your sports watch

While your GPS watch tracks workouts, a smart ring measures what happens between sessions: how well you sleep, how quickly you recover, and when your body is ready for the next session. Many athletes use the ring at night and daily, and the watch when training – together, you get a complete picture of load and recovery 24/7.

What does a smart ring measure?

Sleep and sleep quality

A smart ring is one of the most precise tools for sleep tracking, as it is worn close to the skin all night without disturbance. It records sleep stages (light, deep, and REM sleep), duration, and quality, allowing you to see how training, alcohol intake, or stress affects your sleep – and adjust accordingly. Some models also detect breathing irregularities during sleep for a more detailed picture.

Resting heart rate, heart rate, and HRV

Continuous optical heart rate monitoring provides resting heart rate and heart rate 24/7, without needing to check it yourself – the ring automatically detects when your heart rate rises during activity and when it calms down. Resting heart rate is a stable indicator of general fitness: if it decreases over time, it's typically a sign that your training is effective. Heart rate variability (HRV) complements this by showing how well the body has recovered and if it's ready for the next intense session or needs a lighter day. Together, heart rate and HRV give a continuous picture of how much the body can handle right now – instead of just measuring performance during training.

Oxygen saturation (SpO2)

Blood oxygen saturation is measured automatically 24/7, indicating how well the body oxygenates itself – both daily and during sleep. Values naturally fluctuate, but significant drops can signal sleep disturbances or strain. Over weeks, SpO2 data provides a reliable benchmark for whether recovery keeps pace with training volume.

Body temperature

The ring detects small changes in skin temperature night after night, building a baseline for what's normal for you. Deviations from this baseline are often early signals that the body is under stress – such as high training load or elevated stress levels – and can appear long before you feel it.

Activity and steps

Though primarily designed for sleep and recovery, a smart ring also counts steps, movement, and calories burned throughout the day – without needing a watch to track it. This gives a more accurate picture of overall daily activity, not just planned training, complementing your GPS watch rather than replacing it.

How to choose the right size

A smart ring must fit snugly to measure accurately. Most manufacturers offer a sizing kit to find your size before ordering. If unsure, choose the finger you'll wear the ring on and follow the manufacturer's sizing guide. You can also read RunningXpert's smart ring size guide .

Smart ring without subscription

At RunningXpert, we offer smart rings where you own your data without a subscription. You pay for the ring – not to view your own measurements.