Staying or getting fit with mild copd

Hi I have mild copd but over the last couple of years as my fitness has slipped I can feel the progression catching up with me anyone tried to recover their fitness by running etc I have made a small video about my attempt anyone else had a go Getting Fit at 50 with COPD (This Could Be a Terrible Idea)
https://youtu.be/Ct4uSmm8M0I