Foam Roller Rollouts
Use these two exercises as a progression from the ab wheel. The videos don't do them justice. You've got to try them to understand it.
Keep these in a low to moderate rep range, multiple sets of 5-8 reps. Going high rep on them can make the low back kick in. But you've been warned: This will leave even veteran lifters shaking like a leaf on a tree.
related posts
Real Core Training: Offset Loading
How adding more weight to one side of the body can help you smash even the most stubborn plateaus.
Stealing From the Pros: Back Training
Sure all the pros are roided out to their mutant gills. That doesn't mean we can't still learn some incredibly valuable back-training tips by observing how the big bastards train.
Tip: Use the Bus Driver Exercise for Delts
Looks odd, but it'll hit your shoulders in a way that other delt exercises can't. Check it out.
Tip: Lift This Way, Build Muscle 3 Times Faster
Research shows this training method builds muscle and strength much, much faster. Check out the science.