Running hard and long every single day will certainly lead to burnout. However, you only need to run one mile every day to keep the RW streak alive, and that mile can be as slow and easy as you want it to be.

Is it OK to run hard every day?

Running every day is bad for your health because it increases your risk of overuse injuries like stress fractures, shin splints, and muscle tears. You should run three to five days a week to make sure you're giving your body adequate time to rest and repair.

How many days a week should I run hard?

Four or five days per week

You can reap the rewards of hard training – a stronger heart, more efficient usage of fuel and oxygen, and improved lung capacity – with ample time for recovery and a normal life. 'Four to five is right in that sweet spot,' says Gaudette.