Glute Ham Raise
This exercise will chew your hamstrings up and spit them out. Build serious strength in your posterior chain with this one. Work negatives if you must, or add weight if you have NFL caliber hamstrings.
Cues:
Adjust the pad so you are secure and able to create strong pressure through the balls of your feet into the plate at the top of the exercise
Keep the hips open on the negative and on the positive as well
Stop at parallel each rep
If your thighs are sliding down as you come up your set up is too long
You can use your hands to assist coming up if necessary, or add additional weight if you are sufficiently advanced
Mistakes:
Closing the hips to come up
Lowering quickly
Lowering past parallel and using momentum to come up