I think it is good that you went out! Changing things up helps to prevent burn out for me. I jog slowly, and there are probably some speed walkers that would be with me some of the time. I am slowly getting faster. I don't really know much about speed walking, but would guess it has less impact on your knees amd also works some other muscles and in different ways than jogging.
I think any fitness is good, we have to find what works for us so that we keep doing it. Keep moving! That is how I feel anyway. :) I want to stay mobile amd fit to help me when I am older and to stay healthy.
Nice. This is great information. I'll be more deliberate about alternating between speed walks and jogs. Your posts have been helpful on this journey.