Weighted Decline Sit-ups
[youtube]http://www.youtube.com/watch?v=zcHkaMnjz-g[/youtube]
Weighted Reverse Crunch
[youtube]http://www.youtube.com/watch?v=MePi5ynkXS8[/youtube]
Suicide Planks
[youtube]http://www.youtube.com/watch?v=c1x7Q-DXRM4[/youtube]
X Crunch
[youtube]http://www.youtube.com/watch?v=8vVaETX0kjo[/youtube]