The only heart rate monitor I can roll with is Whoop. I bought a few pairs of the boxers and the monitor goes on the waist band at about 7 O'Clock position.
Which would be better focusing more on getting in shape, with a close second of learning a practical self-defense: Brazilian jiu-jitsu or MMA? - Quora
Why I’m Wearing a Heart Rate Monitor During BJJ Rolling
Nsima Inyang, Curator of Unorthodox forms of Fitness 🤘🏾 | Heart rate sparring statistics courtesy of @whoop . For BJJ athletes, their armband is pretty good and the strap is very very consistent ... | Instagram