I know that no one cares about how strong a person is on the leg extension machine, however I usually do it as my first exercise during my workout to warm up my knees. I can do the entire 250lb stack with one leg for 11-12 reps.
I usually do not attempt this because it's murder on my shins, however I started using the pad that people use when doing squats for additional padding and it no longer hurts.
After leg extensions I usually do Leg presses and then Squats. I can usually do 10 plates on each side for leg presses, however I try not to go that heavy because I end up pinching something in the hip area.
Am I beast, or not really? I really don't see anyone do close to this on the leg extension at my gym. It actually makes my quads super sore.