Zenith On the International Space Station, "zenith" and "nadir" are used instead of "up" and "down", referring to directions within and around the station, relative to the earth. Zenith The zenith is an imaginary point directly "above" a particular location, on the imaginary celestial sphere. "Above" means in the vertical direction opposite to the apparent gravitational force at that location. The opposite direction, i.e. the direction in which gravity pulls, is toward the nadir. The zenith is the "highest" point on the celestial sphere. The word "zenith" derives from an inaccurate reading of the Arabic expression (), meaning "direction of the
Overhead press the weight from the floor (clean and press). The weight is then pressed to overhead until the elbows are fully locked out. As the weight clears the head, the lifter leans forward slightly, or comes directly under, in order to keep balance. As the weight is lowered back to racking position and clears the head again, the lifter leans slightly back. The overhead press is a highly effective compound full-body exercise. The exercise can be done sitting or standing, with alternating arms or with a hammer grip in which the palms are turned in toward the face. Performing it standing