How far down should you go on the deeply angled leg press?

[Deicide]

First time using it....ever...

Should my knees be going all the way back to my shoulders?!

[Bluto]

not sure what kinda legpress youre refering to but in general i tend to go pretty deep but not so deep that my ass lifts from the seat

[Zach Trowbridge]

Is it a Precor or Icarian model?  Those things are at like a 70 degree slant, usually I can get my knees into my chest, but with those I can only get a 90 degree angle at the knee before my butt starts pulling up off the seat.  If your back or glutes leave the seat, you're going too low.

[QuakerOats]

knees to armpits.

[Cap]

knees to armpits.

Not unless you are claiming a 1000+ lb leg press like most.   

Quaker is right though, that ROM is what you need to do.  If you keep a close stance it will be knees to chest.

[thewickedtruth]

go as deep as you can until your lowerback starts to round up out of the seat...tha'ts when it gets dangerous. Anything shorter is a waste of time..

[slaveboy1980]

knees to armpits.

not necessarily. go as deep as you can WITHOUT letting lower back round up out of the seat (or ass leave the seat)

[Bluto]

go deeper than branch warren

actually it's hard not to go deeper than branch warren 

[Geo]