Lesleyfool wrote:Does such a thing exist please?
I have searched all over the internet and cannot find the answer to this.
The reason for that is that it's considered so standard for chest belts to talk to an app to give realtime heart rates that it's not considered worth mentioning, they all do it. FWIW in your situation, I used a Livlov belt talking to the Wahoo app - it may not be the best solution but it worked for my purposes.
A few considerations -
There's two main wireless protocols to consider. The fitness industry developed a protocol called ANT (which very quickly became ANT+ so you'll almost never find original ANT these days, it's all ANT+) to do this kind of stuff, it's now been taken over by Garmin but is the fitness industry standard. But Bluetooth is increasingly becoming the standard protocol as it's so easy to handle with phones - in theory you can add ANT capability to phones but I couldn't get it to work with my (quite old) ANT kit. Having said that, all but the cheapest belts are dual-wireless so broadcast both Bluetooth and ANT - I had to get a dual-protocol belt as I have ANT kit.
My Livlov belt has a single unbroken strap so you have to put it on/off over your head, my old belt opened with a clip so you didn't have to do that. I can imagine that maybe if you were running marathons the clip might chafe but for my purposes I preferred the clip one as it was easier to take off when knackered.
The other issue with belts is fit = I find mine is best just above my nipples but I imagine they may be more awkward for women. Also I find that the clip for shortening my Livlov belt tends to slip a bit in use, but that's not much of a problem as my chest is big enough that it still works even at maximum length. If I had a smaller chest I can imagine sewing/gluing it in place to stop that happening.
Perhaps the most fundamental question is - do you need a belt? In most cases a watch is just as good at recording your heartrate but has the advantage you wear it all the time so you can track your heart and eg steps the whole time. They are not so good for certain sports due to the wrist movements in eg rowing, but for running on a treadmill a watch should be fine. My rather old Garmin watch can broadcast HR to other Garmin devices but not more generally (I think more recent ones can broadcast to anything but not sure) - in practice that's not a real problem on a treadmill. You might think that having HR displayed on a phone in front of you is better but in reality it's fine to just look at your watch occasionally, you soon settle into rhythm where you know a certain pace corresponds to a particular heartrate so you don't need to keep looking, and you run with better form if you're not continually squinting at a screen.