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The Polar RS300X is the perfect training partner. Without knowing your heart rate, you can only get so far. The RS300X combines these three to give you a true understanding of the effort you put in to your workouts.
Body measurement features:
Automatic age-based target zone – bpm / %To help you train safely and effectively, the training computer determines your heart rate target zone limits automatically according to your age-based maximum heart rate (220 minus age). The limits are determined either in beats per minute (bpm), as a percentage (%) of your maximum heart rate, or as a heart rate reserve (% HRR). See also Maximal oxygen uptake (VO2max) and Manual target zone.
Heart rate – bpm / %Heart rate is the measurement of the work your heart does. Heart rate can be expressed as the number of beats per minute or as percentage of your maximum heart rate. Heart rate can also be expressed as a percentage of your heart rate reserve, meaning the difference between your resting heart rate and maximum heart rate (HRR = HRmax - HRrest). In Polar software or during strength training, heart rate can be displayed as a graphical trend.
HR-based target zones with visual and audible alarmYou can define your target zones for a training session based on heart rate to help define the right intensity. When you are out of the preset zones, the training computer will give a visual and audible alarm.
HRmax (age-based)The highest number of heart beats per minute (bpm) during maximum physical exertion. For a rough estimate of your maximum heart rate, subtract your age from 220. HRmax is a useful tool for determining the intensity of training as intensity zones can be defined using HRmax. Some Polar products define maximum heart rate during the Polar Fitness Test, see also HRmax (Polar Fitness Test -based).
HRmax (Polar Fitness test-based)Some Polar products predict your HRmax simultaneously with the Polar Fitness Test. This predicted HRmax value is more accurate than the age-based formula (220 minus age).
Manual target zone – bpm / %This feature enables you to define the target zone as you want and is suitable for your training. You can set the target zone for your training as beats per minute (bpm), as a percentage of your maximum heart rate, or as a percentage of your heart rate reserve (HRR%).
Polar Fitness TestPolar Fitness Test measures your aerobic fitness at rest in just five minutes. The result, Polar OwnIndex, evaluates your maximal oxygen uptake (VO2max). With the Polar Fitness Test you can measure your aerobic fitness by yourself, automatically and without any exertion. All you need is your training computer. The Polar Fitness Test is as accurate in predicting the VO2max as any sub maximal fitness test. The test is based on heart rate and heart rate variability at rest and personal information.
Polar OwnCal® – calorie expenditurePolar OwnCal calculates the number of kilocalories expended during training. This feature allows you to follow the kilocalories expended during one training session and cumulative kilocalories expended during several training sessions. Some Polar products also estimate the fat-burning percentage (fat% on display), that is, kilocalories expended from fat during a workout which is expressed as a percentage of the total kilocalories burned.
Polar OwnCode® (5kHz) – coded transmissionCoded heart rate transmission automatically locks in a code to transmit your heart rate to the training computer. The training computer picks up your heart rate from your transmitter only. Coding prevents interference from other training computers.
Polar OwnZone® – personal heart rate zonePolar OwnZone® determines your personal heart rate limits for a training session. Depending on the day and time, your physical state may vary, for instance, if you are stressed or tired, or if you are not fully recovered from your latest training session, Polar can determine that information from your heart rate and guide you to your ideal training zone for that moment.
Polar sport zonesPolar sport zones provide an easy way to select and monitor the intensity of your training and to follow sport zones based training programs. Training is divided into five zones based on percentages of your maximum heart rate: very light (50-60%HRmax), light (60-70%HRmax), moderate (70-80%HRmax), hard (80-90%HRmax) and maximum (90-100%HRmax).
TotalsTotals includes your training data starting from the last reset enabling you to follow your long-term training.
Weekly historyWeekly history gathers your weekly training data. By selecting a week, you can review your training data for the week.
Automatic lap recordingWith this feature you can set your training computer to take laps based on preset distance, for example, every 1 km/mi.
Display zoomDisplay zoom feature allows you to zoom in information on the display during training.
Graphical target zone indicatorThis feature points out graphically on the display the zone you are in during a training session helping you to stay on the desired intensity zone.
HeartTouch – button-free operation of wrist unitWhen HeartTouch is on, different training information during training can be accessed without pressing buttons, for instance, when gloves make pressing buttons difficult, by bringing your training computer close to your transmitter.
Interval trainer guided workouts – heart rate / pace / distanceCreate interval guided workouts based on time, heart rate, speed/pace or distance guidance with up to three linked timers or distances and up to three target zones.
Time and distance based interval timersUse timers, for example, as a training tool in interval training to tell you when to switch from a harder to a lighter period and vice versa. The timers can be time- or distance- based.
User configurable displays – two linesThis feature allows you to configure training computer displays to show the information that you need during your training session. Configure the displays either in the training computer or in ProTrainer 5 software.
ZoneLockZoneLock feature helps you to accumulate certain intensity. You can either lock a zone before a training session or during it by pressing a button when you are on the desired zone.
ZonePointerZonePointer is a visible and moving symbol on the training computer display indicating whether you are inside the pre-set target zone. This feature helps you to reach the desired intensity/pace/speed/cadence targets.
Features in watch are great but 2 stars deducted since it has to be sent to Polar for a new battery when it runs out and you need to buy the flowlink accessory to transfer training... Read morePublished 23 days ago by Amazon Customer
I am really pleased with this. It has just enough functionality but not so much it is difficult to use. This is not for elite athletes but it does every else except that. Read morePublished 1 month ago by M. Crandall
This is my second one of these. It's technology and model are a few years old now, but it still has more features than I'll actually use. Bought for a great price.Published 1 month ago by Mr. Colin Brooks
Great bit of kit to log my runs and to keep tack of my exercise. This is the second one of these which I've bought.
Easy to use. linked to my GPS unit easily.
I bought this as an upgrade from the basic PolarHRM which ive used for 2 yrs .The best feature on the rs300 is the multiple files ,so you can store and review your work outs over... Read morePublished 1 month ago by Nigel Martin
I like this pulse reading watch. It is very good plus water resistant. Easy you can swim with it, no a problem.Published 5 months ago by M2TCJ
I understand that it is a great watch with lots of features from all the reviews that I read prior to purchasing. Read morePublished 7 months ago by Frontinus
This is an excellent buy, easy to use although the instructions that come with it are a bit vague but easy to down load the full instructions from the polar website. Read morePublished 7 months ago by shellie