ive been using the dumbbells also, but if u can use that machine he uses in the video my friend uses it and he says u FEEL it..

I just did the smith machine thrusts. It's good! This exercise makes it really easy to concentrate on your lower abs. Hit up Mr. Smith, if you can!

self explanatory my friend... Check out the pic/video... it just helps you add weight to your hit thrust when you wanna use heavier weight than just a 10-20lb dumbbell between your feet while performing the hip-thrusts... the dumbbells work well but you don't wanna swing a 40 lb dumbbell over your head god forbid it slips and leads to permanent LIGHTS OUT...