How to Do a knee curl-up on a bench to achieve six pack abs

When it comes to building six pack abs, there's no better way to summarize the process than to say no pain, no gain. Sexiness requires work, guys and gals, but we promise the pain will be well worth it!

If you're looking to get lean and trim abs fast, then try out these knee curl-ups. The exercises are done on a bench and quickly ton your lower abs.

The main reason to work out abs is because strong abs will stabilize your lower back and prevent you from an injury; but as a side benefit a 6-pack looks great!