Heart-rate sensors

Heart-rate monitors for grappling

Randori does not need a sensor. With one, your session carries measured heart rate, minute by minute, and effort and load are read from it. Without one, calories are estimated from session length, session type and your weight.

Any Bluetooth heart-rate sensor works. For grappling, an armband stays on better than a chest strap.

Why an armband

In grappling, a chest strap sits under everything that lands on a chest: knees, pressure passes, side control. An armband on the upper arm stays out of the way. Randori reads any sensor that speaks the standard Bluetooth heart-rate profile, so the chest strap below works too, if you prefer one.

Links open Amazon. Purchases support Randori at no extra cost to you. As an Amazon Associate, Randori earns from qualifying purchases.

  • Polar Verity Sense

    Our pick

    Polar Verity Sense

    The grappling pick — an armband stays out of the way when the mat gets heavy.

    Amazon · Polar

  • Polar H10

    Polar H10

    The accuracy reference, if you prefer a chest strap.

    Amazon · Polar

  • COOSPO HW9 armband

    COOSPO HW9 armband

    The budget armband that speaks the same standard.

    Amazon · COOSPO

  • Wahoo TICKR FIT

    Wahoo TICKR FIT

    Another armband, with a comfortable, adjustable strap.

    Amazon · Wahoo

  • WHOOP

    WHOOP

    Already wear one? One switch makes it a sensor here.

    Connecting a WHOOP · WHOOP

Connecting a WHOOP

  1. Open the Whoop app.
  2. In device settings, turn on Broadcast Heart Rate.
  3. It appears in Randori's sensor list like any other sensor. Tap it.

Needs an active Whoop membership.