Hip extension = Power potential
Hip extension mobility deficits are a huge power leak for some athletes. A major cause of this is sitting. Student-athletes are the worst because they spend a lot of time with their hips flexed in a chair position. A lot of sports require the expression of hip extension. Therefore the hip joint must allow for this requirement.
Working on the hip extension from a functional mobility and strength standpoint is something that all athletes should do. Layering power training on top of hips that can actually express extension well is the key to unleashing more athletic potential.
This is especially important for running athletes. A major component of your recovery work and training should be on maintaining, accessing, and improving hip extension so that you can get the most out of your training and ultimately your sport.