The single-arm pullover amplifies core activation to the extreme. There's an anti-rotation and rotary stability component that isn't present during the bilateral or isolateral versions of the pullover.
Add in the leg raise hold as I have my NFL athlete Fernando Velasco doing in this video and you'll find this to be one of the most challenging core exercises there is. It's also an incredible movement for exposing and addressing imbalances throughout the kinetic chain.
related posts
Do the Big Lifts Every Day
If it's important, do it every day. But how do you program the big lifts daily and not crash? Like this.
8 Back Exercises You've Never Even Seen
These new rowing exercises will not only build a thick back, they'll force you to (finally) use optimal form.
The Heavyweight Lifting Match
Romanian deadlifts and stiff-legged deadlifts. There is a difference. Which one is right for you? Check out this info.
Tip: A New Strategy for Push-Ups
Add this simple technique fix to your push-ups and you'll get much better results.