Forcing yourself to include so-called quality training sessions in your weekly training schedule.
This generally involves interval-type training including 15 x 30/30 or 10 x 400 m or 8 x 800 m. This exercise does not have to be done on an athletics track. However, it's important to run on flat calibrated terrain. Regularly participating in 10 km type competitions is also an important factor in reducing the decline of the VO2max after the age of 50.
Running is a fantastic means of escape. For the body, it's also an unfathomable source of well-being. This is because, beyond the inevitable decline, runners discover a new way of approaching the effort required and coping with the body's limitations during the ageing process. Running is a school of life:particularly after the age of 50!