Drop forearm to forearm and back up, all on a wobbly dome.
Keep your hips from rocking side to side as you change levels.
Moving from high plank to forearm plank and back, one arm at a time, means your core spends the whole set supported on three shifting points across a dome that moves with every transfer. Each level change tries to twist and rock your hips toward the working arm, and your midsection's job is to refuse. It earns its place as anti-rotation core training that also builds serious work capacity through the arms and trunk.
Each arm transition shifts your support to one side, and on the dome that shift is amplified. Widen your feet, slow every transition and think about keeping your belt buckle pointing straight down.
Leading with the same arm every time builds a lopsided pattern and fatigues one side first. Swapping leaders keeps the work even and exposes whichever side is weaker.
Core is the target, the anti-rotation demand during transitions is the point. Your arms will absolutely feel it too, but if your arms fail long before your trunk feels anything, slow down, you are rushing through the hard part.
