Standard push-up, unstable base, double the chest and core demand.
Keep your core locked and elbows around 45 degrees, let the dome teach you to stabilize.
Gripping the edges of the flat side puts your chest through a normal push-up pressing arc while the platform tilts with every ounce of uneven pressure, so the pecs work as movers and stabilisers at once. Your triceps finish each lockout and your shoulders hold the pressing line steady against the wobble. It earns a place as the standard unstable push-up, harder than the floor without changing the movement you already know.
Not more size, the floor lets you do more quality reps. What the dome adds is stabiliser work and pressing control, so treat it as a complement to regular push-ups rather than a replacement.
Flat side up. You grip its edges at about shoulder width, which gives your hands something solid while the dome underneath supplies the instability.
Gripping the edges should actually help, since it keeps the wrists straighter than flat palms. If they still complain, check that your shoulders are stacked over your hands and you are not dumping weight forward.
