Hello my friend. First of all, thanks for following me. I have returned and done the same. I find your post today very interesting. You talked about an activity watch and interval training. I grappled with both these things last year before the winter set in. I am not a runner myself, I quite frankly dislike running. I prefer cycling. I have a Garmin Edge which I strapped to my arm - a bit bulky, but less problematic and much more accurate than a phone. Coupled with a cycling Heart Rate monitor, it worked great. You really need these metrics (speed, pace and HR) if you want to do interval training. It makes it much easier and you feel much more motivated seeing accurate data while exercising.

I understand you may not wish to wear the watch all the time. I feel the same way. So I would suggest you get the Amazfit Pace Bip. It is not a watch many would wear all the time, it's light, inexpensive, battery lasts very long .. it's an all-round great device. I will probably get one this year myself.

I ran intervals for about two months and it really helped me increase my performance. I do the same when cycling too. You get to see the results if you have an activity tracker device. Otherwise, it is pretty hard to see the progress.

For the moment, I haven't got back to running or cycling, but when I do, I will post about it. I hope you will keep an eye out for that post ;-) Let's try together as steemians to get more healthy.