Both probably! Getting used to running further will make 13 miles feel shorter and you'll have more endurance so covering the distance should feel easier. Then adding intervals and tempo sessions will help with increasing top speed and your ability to hold a higher speed for longer.
Both probably! Getting used to running further will make 13 miles feel shorter and you'll have more endurance so covering the distance should feel easier. Then adding intervals and tempo sessions will help with increasing top speed and your ability to hold a higher speed for longer.