If you want abs that look like they've been digitally enhanced by CGI, try the Abzilla workout. All you need is a pair of dumbbells -- the heavier, the better -- and some willpower to complete these core-crushing combinations of plank variations and farmer's carries. The planks will sculpt abs that pop, while the carries will blast away the fat covering them.

Here's how it works: Perform the following five pairs of planks and carries back-to-back with no rest. Each pair takes one minute to complete, so do the plank for 30 seconds before immediately moving on to the carry for 30 seconds. When you complete all five pairings, you've done one circuit. Repeat the circuit two more times for an ab-crushing 15-minute workout.

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