If your vert hasn’t increased in weeks or months of training, its usually because of one (or more) of these reasons 1) Slow Rate of Force Development (RFD) You may be able to produce a lot of force through your strength, but you can’t express force fast enough. Vertical jump happens in ~200–300 ms. If your training is mostly slow lifts and controlled tempos, you’re building strength that never shows up in fast movements like jumping or sprinting 2) Low Force Production! Speed without force is useless. If you don’t have enough raw force capacity (relative to bodyweight), there’s nothing to convert into power. Get Stronger! 3) CNS Fatigue! You’re training hard, but not recovering. Excess volume, too many max intent days, poor sleep, or constant plyos dull neural output. When the nervous system is fatigued, jump height drops even if muscles feel fine. (most athletes constantly deal with CNS fatigue, my main advantage is I dont) 4) Neuromuscular Inhibition! refers to the decrease in a muscle’s ability to activate and produce force because the nervous system is sending braking signals (is a protection mechanism so you dont hurt your self). Athletes usually see an increase after being injured. Stay healthy, be consistent in the weight room, continue to add plyometrics into your workouts! 5) Poor Intermuscular CoordinationYour muscles aren’t firing in the right sequence. A vertical jump is timing dependent: hips → knees → ankles. If energy leaks anywhere in that chain, force never reaches the ground efficiently..