Crisscross your legs and let your lower abs scream.
Press your lower back flat into the floor. If it arches, raise your legs higher.
With your legs hovering just off the floor, scissors force the lower portion of your abs and the deep core to hold your pelvis steady while your legs cross and recross. The work is not in the crossing, it is in refusing to let your lower back peel off the floor while the levers move. Simple setup, zero kit, and a burn that arrives fast.
Your legs are too low for your current core strength, so your back arches to compensate. Raise your legs higher, press your lower back into the floor, and lower them over time as you get stronger.
Flutter kicks move the legs up and down, scissors cross them side to side over each other. The sideways crossing adds a rotational challenge your core has to cancel out. Both live or die on keeping the back flat.
Until your form breaks, not until you hit a number. The set is over the moment your lower back lifts or your legs start swinging wildly. Quality time under tension beats big rep counts.
