Just like women and ruthless dictators, some muscles are harder to reach than others. That's why Part 4 of this six-part series works your abs with explosive movements. (Read Part 1, 2 and 3.) It's the only way to maximally target your fast-twitch muscle fibers--the ones with the greatest potential for size and strength gains.
Perform this workout 2-3 times per week. Do the exercises as straight sets, completing all sets of each one before moving on to the next.