THis is a Sissy squat. I've read a while ago about points of flexion. And the sissy squat gave 2 out of the 3 points of flexion.
midrange movements
Quads: squats
Hamstrings: stiff-legged deadlifts (also a stretch movement)
Lats: wide-grip chins to the front
Midback: behind-the-neck pulldowns
Delts: dumbbell presses
Chest: bench presses
Biceps: barbell curls or close-grip undergrip pulldowns
Triceps: lying extensions or close-grip bench presses
Abdominals: kneeups
stretch-position exercises
Quads: sissy squats
Hamstrings: stiff-legged deadlifts
Lats: pullovers
Midback: close-grip cable rows
Delts: incline one-arm laterals
Chest: dumbbell flyes
Biceps: incline curls
Triceps: overhead extensions
Abs: cable crunches with low-back support
Calves: donkey calf raises
contracted-position exercises
Quads: sissy squats
Hamstrings: stiff-legged deadlifts
Lats: pullovers
Midback: close-grip cable rows
Delts: incline one-arm laterals
Chest: dumbbell flyes
Biceps: incline curls
Triceps: overhead extensions
Abs: cable crunches with low-back support
Calves: donkey calf raises