That's an old Vince Gironda technique.
Works really well like a lot of his techniques.
Leaning back during a leg extension increases the stretch on the rectus femoris by opening the hip angle. This deeper stretch matters because stretch-mediated hypertrophy—growth triggered by training muscles at longer lengths—has been shown to be a powerful stimulus for muscle growth.Definitely in my opinion beneficial
Does leaning back in the seat count?
one of the better videos on his sissy squats .....
Sissy squats are not the proper name. Those things are a real bitch.
