I tried the 'crunch smash' to sculpt my abs and obliques

This variation on the classic crunch adds more focus to the obliques through a twisting motion and challenges you to 'smash' your elbow into your knees.
Fitgurú on MSN

Forget Crunches? This Crunch Smash Move Is Transforming Core WorkoutsAre You Doing It Yet?

Fitness experts say this dynamic twist on a classic exercise could be the missing link for stronger abs and defined obliques.

Not sit-ups — I have tried almost every abs exercise, and this is the one I always do

When I only have time for one abs exercise, I make it the bicycle crunch ...
Health.com

4 Bodyweight Exercises That Strengthen Your Core as Effectively as a Plank

Jakob Roze, CSCS, is a health writer and high-end personal trainer. He is the founder and CEO of RozeFit, a high-end concierge personal training practice and online blog. Several bodyweight exercises ...