Pedal on the dome, abs do the work.
Stay balanced through your core, not your hands, and keep your back braced.
Sitting back on the dome with your feet up puts your core in charge of two jobs at once, holding the V position steady on an unstable surface while your legs pedal in and out. The extend-and-pull cycle of each leg keeps the abs under continuous tension, and the dome amplifies every lapse in bracing into a visible wobble. It earns its place as floor-free ab work where the exercise polices its own form.
There is no floor supporting your back, you balance your whole trunk on the dome while pedalling, so the core works isometrically to hold position and dynamically to move the legs at the same time. The instability is the upgrade.
Leaning too far back or pedalling too fast. Sit up a touch, slow the legs down, and let your hands rest lightly on the edges as a safety net rather than a support, the brace should live in your midsection.
Aim for controlled sets of 20 to 40 seconds or a target rep count per leg, ending when your feet start touching down or the wobble takes over. Crisp, extended kicks beat fast, short flutters every time.
