I have used it, supports DDP Yoga Now, although neither the heart rate monitor manufacturer nor DDP Yoga say it works well, you just need to run the app first and then the Monitor connect the tape, no problem when using it in DDPYogaNow on my iPad Pro. The strap is adjustable in length and made from a very stretchy, soft neoprene material that's comfortable to wear - you want it to be snug enough around your chest so it certainly won't move, but it doesn't feel restrictive.
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