I ask my athletes to share with me their training, as certain patterns can be important for a coach to recognize.
Personally, I track my workouts two ways. I write them all down on a calendar, and include any strength training or other forms of exercise. I take my Garmin with me on every run, so my running data is all collected on my Garmin page.
Find a way that works for you. Cause you know I’m going to ask you!