Most recently I have been trying to do much more cardio in the gym to try and get fit - and I am considering buying a smartwatch or a fitness tracker for heart rate monitering. My phone is quite bulky and I don't like wearing a running armband as it is uncomfortable and gets very sweaty. I was wondering whether if I were to buy a fitness tracker, that spotify running is able to detect running tempo using the fitness tracker rather than the phone itself (so I don't have to set manual tempos before I run, as my tempos tend to change, or I don't have to run with the phone in my hand while I'm sweating buckets) ?

I would also love the ability to run spotify running directly from a fitness tracker and play wirelessly via bluetooth headphones, eliminating the need for me to take my phone into the gym at all, but I don't think that is possible either?

Look forward to your replies. Thanks.