If you want to see how you're doing, you can get a Huawei GT 3 watch that doesn't cost much. Out of all the smart watches, it's one of the easiest and longest life battery. I've had mine aboyt 3 years now, and it's been brilliant. It keeps records of your bike rides so you can compare one against another. It gives you all the data from its own GPS, including what your heart did and how many calories you burned. It doesn't plan cycle routes. It just shows what you did.
It has many other useful functions, like sleep monitoring, sms messages, buzzes when your phone rings when you're in the garden and you left your phone in the house, stress monitoring, oxygen level monitoring, etc. It's many times better than any Fitbit, Apple or Google watch. Works seemlessly.