Everybody here talked about an android app, but i just want to give some suggestion regarding the fitness tracker.
First thing first, you need to evaluate your budget range.It ranges from $30 to about $400.On the whole, although, fitness trackers have a tendency to supply more extensive work out info and endure longer on a charge, whilst smartwatches be more effective designed for people who wish to be informed without needing to take out their smartphones.
But like you said above, you just started over again after a long time without jogging, i guess the very basic model or newbie model is great for you. The best newbie tracker or if you are in a tight budget, would be either Misfit Flash or Xiaomi Mi Band 2. The battery for these cheap tracker can last from 1 to 6 month. You can take a look at the comparison here.
https://wearvs.com/compare/misfit-flash-vs-xiaomi-mi-band-2