Pain is inevitable. Suffering is optional.
I’ve run about an hour every day, six days a week.
I’m aiming at increasing the distance I run, so speed is less of an issue.
To keep on going, you have to keep up the rhythm. This is the important thing for long-term projects. Once you set the pace, the rest will follow. The problem is getting the flywheel to spin at a set speed—and to get to that point takes as much concentration and effort as you can manage.