My favorite ab workout is 4x8 weighted situps on a decline bench while holding a heavy dumbell on my chest. Makes my abs look like boulders. Fuck all those old gay ass workouts like p90x with hundreds of reps at different, abs should be treated like any other muscle group.

That said every chart I see says decline situps mainly work red area, and yellow area is secondary. What's a good workout to hit the yellow hard with weight? Hanging knee raises with heavy weight?