Hands up on a bench, plank long, hold steady.
Keep a flat back from head to heels, no sagging hips or rounded shoulders.
Putting your hands on a bench tips your bodyweight toward your feet, so your core supports a smaller share of the load than in a floor plank. Every other demand stays identical, the straight line, the brace, the steady breathing, which makes it the smartest place to learn planking properly instead of shaking through bad floor holds. Own long, clean sets here and the floor version arrives quickly.
Yes, and that is the point. The higher the surface under your hands, the lighter the load on your core, so you can scale difficulty by simply picking a lower bench over time.
For as long as the straight line survives. The clock stops mattering the moment your hips sag or hike, so end the set there rather than collecting junk seconds.
Your muscles are fatiguing and firing hard to hold position, which is normal. Keep breathing steadily rather than holding your breath, and the shakes become just noise.
