Functional overreaching is essentially short-term overtraining where you have a goal of digging yourself into a recovery ditch. Two weeks—two ball-busting weeks. Get to work and reap the benefits.
If you plan to see visible muscle growth, the hypertrophic effects of eccentric training mean you can include up to 50% of your resistance training workouts in the form of eccentric exercises.
The vast majority of exercises integrated into our modern resistance training workouts focus on the concentric phase (muscle shortening/contracting) of the movement.