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There are a number of options for adding heart rate monitoring to a smartphone.
* The [http://www.amazon.com/Polar-Bluetooth-Smart-Heart-Sensor/dp/B007S088F4 Polar H7 heart rate monitor] is [http://www.polar.com/us-en/support/compatibility_of_polar_h6_h7_heart_rate_sensor compatible] with iPhone 4S/5 and many Android phones, and it's my recommended approach for getting the best and heart rate monitoring. It supports many apps, including [https://itunes.apple.com/us/app/ismoothrun-pro-gps-pedometer/id410965399?mt=8 iSmoothRun], [[Runkeeper]], [[Mapmyrun]](+), EndoMondo (Pro), Runmeter, and others. It also works nicely with [[Heart Rate Variability]] apps. (<jfs id="B007S088F4" noreferb="true"/>.)
* For optical heart rate monitoring, the [http://www.amazon.com/[Scosche-Rhythm-Heart-Monitor-Armband/dp/B00JQHTJS2/ref=sr_1_1?ie=UTF8&qid=1411506758&sr=8-1&keywords=Scosche+RHYTHM%2B Scosche RHYTHM+]] goes around your upper arm and is less intrusive than a chest strap. However, this device requires recharging periodically as it only has seven hours of battery life, and optical heart rate monitoring is not as accurate as a chest strap. In particular, it will not provide [[Heart Rate Variability]] data.
* The [http://www.amazon.com/Wahoo-Fitness-WFFisica01-Key-iPhone/dp/B0042WGO3Y Wahoo Key] is a $55 dongle that adds Ant+ support to an iPhone 4S/4/3GS. This allows you to use the {{Garmin HRM}}, {{Garmin Footpod}} and other Ant+ accessories. It works with most apps including RunKeeper, MapMyRun(+), EndoMondo (Pro), Runmeter. Note that the dongle may cause problems finding a waterproof case.
* The [http://www.amazon.com/Garmin-Adapter-iPhone-Monitor-Cadence/dp/B005ZSYEOK Garmin Ant+ Adapter] is similar to the [http://www.amazon.com/Wahoo-Fitness-WFFisica01-Key-iPhone/dp/B0042WGO3Y Wahoo Key] but it has limited app support.