That's not how you do leg presses , you should never fully extend your legs ,lock your knees.
This is how you do it perfect form
LOL I'm sure Dorian would appreciate this chocolate native guy's training advice.
Dorian had the most perfect form of all powerlifters/bodybuilders when training,apart from Ed Coan.
I haven't payed attention of him locking the knees but I agree. I never lock them out totally but I come damn close,and it's the best way.
And the guy in the video does sort of half reps too.