Rendezvu
    On a mission to get more people to enjoy the outdoors© 2026
    RendezvuAboutFor HostsFor BrandsFor Shoppers
    LegalTermsPrivacy
    ResourcesDocsContactFeedback
    CommunityInstagramLinkedInNewsletterCareers
    Rendezvu
    On a mission to get more people to enjoy the outdoors© 2026
    RendezvuAboutFor HostsFor BrandsFor Shoppers
    LegalTermsPrivacy
    ResourcesDocsContactFeedback
    CommunityInstagramLinkedInNewsletterCareers

    Brand: COROS

    Category: Running Heart Rate Monitors

    Recommended by James Sieber, Running & Strength Coach || Peak Pursuits Podcast Host — Victoria, Australia

    Price: $79

    Expert Review

    This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.

    Recommended by James Sieber

    Frequently asked questions

    What does James Sieber say about the Heart Rate Monitor?

    This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.

    Why does James Sieber recommend COROS?

    James Sieber recommends the COROS Heart Rate Monitor for running heart rate monitors. This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.

    Is the Heart Rate Monitor a good running heart rate monitor?

    Yes — James Sieber recommends the Heart Rate Monitor by COROS as their running heart rate monitors pick. This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.

    View James Sieber's expert gear recommendations on Rendezvu

    Rendezvu
    On a mission to get more people to enjoy the outdoors© 2026
    RendezvuAboutFor HostsFor BrandsFor Shoppers
    LegalTermsPrivacy
    ResourcesDocsContactFeedback
    CommunityInstagramLinkedInNewsletterCareers
    Rendezvu
    Heart Rate Monitor by COROS — recommended by James Sieber
    Wearables

    Heart Rate Monitor

    James Sieber
    James SieberRecommended in “Gear”
    This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.
    Purchasing through this link directly supports James
    Wearables

    Heart Rate Monitor

    James Sieber
    James SieberRecommended in “Gear”
    This arm band changed the Heart Rate game for me. Chest straps never worked, I felt constircted and chaffed. When Coros brought this band out, it allowed me to trust and use HR data again. The data seems very accurate, only with a small delay (meaning it's not reliable for very short efforts or immediate feedback starting an effort). This is the go-to option for people I coach. Only issues have been with tattoos, and they tend to last ~24 months.
    Purchasing through this link directly supports James
    Heart Rate Monitor by COROS — recommended by James Sieber

    This product is for…

    Runners, cyclists, and multi-sport athletes who want accurate HR data without a chest strap—especially those who've had chafing, comfort, or reliability issues with chest straps. Data-focused athletes tracking effort across long or varied training are the core audience.

    Worth noting…

    Tattoos can interfere with optical accuracy, and hosts note a lifespan of roughly 24 months. Not suitable where instant HR response at the start of an effort is critical.