Constructive Interference

Managing how hard you work and how hard you don't has implications on your body's ability to perform and ward off injury. 

In theory, this should be applied, its called recovery.Adapted from How much is too much? (Part 1) International Olympic Committee consensus statement on load in sport and risk of injury

Injury caused by training error, Its kind of like a watching a scary movie, everyone gets a sense that something is going to happen, but nobody knows just when.  

The monster in the closet, Too much too soon with no time to recover. Again, taken from How much is too much? (Part 1) International Olympic Committee consensus statement on load in sport and risk of injury

To put it simply, no time off, too much volume, intensity, or frequency, can cause tissue to enter the cascade of pathology and ailment. It's one of the reasons why you are not supposed to run sprints 7 days in a week or try to achieve max effort 3 weight lifting sessions in a row. This all sounds crazy on doesn't it,  but the real difficulty lies in how to manage work loads over the long term, how to make it through the season or train for you next goal injury free.  That's the real monster in the closet, and your knight in shining armour is known as training periodization