When To Do Doubles
Now that you’ve seen the advantages and disadvantages of running twice per day, it’s easier to appreciate what type of runner would benefit from incorporating double runs into their training routine.
Generally, doubles will benefit more experienced runners who have maximized aerobic development but still need to boost mileage without having their easy days be over 80-90 minutes. Or, they’re most beneficial for runners who are looking to recover more efficiently in preparation for harder workouts.
The chart above shows a brief breakdown of what type of mileage numbers you should be at before adding doubles to your training regimen: