An aerobic step platform that sets to 5, 7 or 9 inches, three heights that let the same board carry a warm-up, a working set and a high-intensity finish without swapping equipment. Raising the platform changes more than step height: it changes the range of motion for split squats, the angle for push ups and the body position for mountain climbers, which is why one adjustable board replaces several fixed ones. The deck measures 28 to 30 inches long by 11 inches wide and stands 5 to 9 inches high depending on the setting, wide enough for both feet in a lateral step. Underneath, a grid structure spreads load across the whole footprint and supports up to 330 lbs, so a heavier user can jump onto it rather than stepping carefully. The surface is textured for grip and holds a training shoe even when a session gets sweaty, while anti-slip foot pads keep the board still on a hard floor and protect the finish from scratches. Both risers store under the platform when they are not in use, so the whole thing stacks flat against a wall instead of leaving loose parts behind. Made from PP and ABS, it weighs 6 lbs and moves easily between home, office or a workout lesson in the gym, which is the difference between a platform that gets used and one that stays in a cupboard.