It's a variation of a Nordic curl that places an emphasis is on increasing hamstring activation through manipulating the leverage.
You'll extend your hips throughout the movement until you reach a high (but bearable) level of engagement. This will gradually increase the load placed on the hamstrings to which the range of movement will either be relatively moderate or large, dependent on how advanced you are.
How to do it:
• First, set the barbell up and position yourself in the same starting position you'd be in during a Nordic curl.
• Start from the top with your hips hinged back and your torso forward, then extend your hips forward.
To perform the rep, allow your torso to rise to an upright position, while pressing your hips forward aiming to achieve full extension.
Then as your hamstrings are about to give way, retract your hips and drop your torso to decrease the leverage. – Ryan Sapstead
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