Improve Health by walking

Hello,
I hope you all stay safe and Healthy in this difficult time with Corona. I try to run everyday for 30min to 1h on my Treadmill to improve my health because I'm not the youngest and want to stay safe of the Virus. My Treadmill does not have a good tracking tool for my runs, that's why I'm asking you guys if you can give me any advice on what I can buy to get good tracking. My son told me I got to get a smartwatch but they are very expensive I think. I started eating healthy foods as well, maybe I should track this too?
Greetings.

Wow, you have something in mind! I would also like to do so many sports. I'm too lazy. ^^ When I do sports I collect all the data with my cell phone, but I have a friend who uses his Apple smartwatch. This smartwatch is definitely too expensive for you. There are many cheap alternatives, but I'm not that familiar with them. Stay healthy!