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The most common error Cavaliere sees is when guys bend at the hips as they finish off each rep. After all, your hips and glutes are part of your core. When you bend, you break your total-body tension. You also take some of the onus off of your rectus abdominis (six-pack) muscles, meaning you get far fewer core-strengthening benefits from each rep.
Check out Cavalieres smart demo series to help you nail your form. His first three reps are the way you want to perform the rollouthis hips are stable and controlled. He sets up on his knees, and then he maintains that strong position throughout the entire exercise. He doesn't bend or sink his butt back toward his heels at all.
If his instruction doesnt make sense, keep watching the next three reps. Here, we see Cavaliere showing what you should avoid at all costs. See his hips bend and his butt almost touching his heels at the end of each rep? Thats how most guys get it wrongand it's exactly what you wont do any more.
Try it out, and you'll immediately know if you're using the proper form. The best part about this exercise is once you feel it done right youll know immediately because its much harder, Cavaliere says.
Since you're using much more effective movements, you might only be able to do a few reps with proper form, compared to high volume using the old, incorrect method. Dont worry; Cavaliere says that you'll only need 10 to 20 reps to really get a good workout when you're rolling out properly.