Right side up?
You may not be able to walk up to a rack and press a bodyweight barbell over your head. (It is said that only one in 150,000 individuals are capable of this feat.) But you may be able to kick yourself up against the wall into a handstand and hold for time (assuming you know the fundamentals of taking load overhead: active shoulders, fully extended arms, tight midsection).
Static holds build strength. This is true in weight training and in gymnastics. In weight training we work against external objects. In gymnastics, we work against our own mass.
Full-range strength movement is developed incrementally and from eccentric to concentric. The first step is developing the ability to support, or hold, one’s own mass. Once confident, and somewhat controlled, in a support position, you can progress toward the negative (eccentric or “lowering”) phase of the movement (like a handstand push-up, for example). You slowly fail, literally falling through the motion, until eventually you can start to control the rate of descent. With continued exposure to this sort of intentional “failure,” you will develop control and comfort and eventually be able to stop on a dime, mid-movement. From that kind of control, it’s a relatively short step to mastery of the full concentric (or “raising”) phase.