I had an umbilical hernia 3 years ago and the doctor who repaired it told me the Leg Press was particularly bad for causing hernia's. He said squats are OK. I'm always a bit skeptical about doctor's advice when it comes to weight lifting, especially since he wasn't a lifter himself.
It seems to me that the position of your torso in relation to your legs is similar for both the squat and leg press. Has anyone ever heard of Leg Presses being a greater risk that squats or hack squats for hernia's?