Wide star plank on the dome, then drive knee to elbow.
Keep your hips from piking up, hold the plank line as the knee drives in.
The wide star stance changes the plank's geometry, stretching your base long and low so your core holds tension across a bigger frame, all on a dome that shifts under your hands. Driving each knee up to the same-side elbow then collapses that base on one side, forcing your midsection to hold the line through the transition. It earns a place as advanced plank work that trains both the wide static hold and moving in and out of it.
It lengthens and lowers your base, so your core holds tension across a stretched position instead of a compact one. It feels easier to balance but harder to keep the hips from sagging, which is the trap.
Same side, driving the knee up and out toward its own elbow. That keeps the movement in the hip's outside line rather than the cross-body twist of a crossover climber.
Your weight shifts as the leg leaves the floor and your hands compensate unevenly. Slow the knee drive down and press evenly through both hands so the platform stays quiet.
