As you would with an incline, but on a flat bench. In other words, your elbows perpendicular with the bench. The problem is in finding a bench high enough to do without touching the ground.
I should probably add that, one big flaw with the reflex itself (LS and PS) is that the farther you go, the farther you detrain that reflex and weaken the effect. After all, people use this kind of modality in order to gain flexibility at a quick rate. I don't think it's a problem here because you'll be adding progressive elements, either adding more stretch time, going deeper, or increasing the load itself. But, at the same time, LS will probably feel easier anyway as you become more flexible. Thus, it's probably not advisable to make a fetish of going more extreme with these stretches, or going all out with the LS during your first time. You just want a little bit of the effect each time out, not "oh my God, the PAIN!!!!" You don't need to because you're applying it 3x-a-week, rather than once or twice-a-week as you would in a program such as DC. Finally, remember that PS (pulse stretch) is itself more effective than LS. Once LS becomes pretty comfortable with you, then you can switch toward the more effective and dangerous PS and really strain the area.
Don't you love all of the acronyms?
The extreme, extreme variation of bicep curl is something like what you'd do in DC (except with a progressive load element.) I don't recommend this, but hey if you're curious . . .
1) You'd take a cable crossover machine with the pulleys on high.
2) Initially, you'd do a motion similar to a cable-based decline press with your knee forward. You do this just so that you get the cables across your body.
3) With the grips fully in front of you, you rotate your grip, so that it becomes a curling motion, lower your elbow joint to around waistline. This will be your starting position.
4) Then, as you "lower" the weight, you basically pivot your elbow joint backwards until they're behind and above your shoulders (or whenever you can't go anymore.) When your elbow stops, you straighten out your elbow. And while you're doing this, you lean forward and downwards as much as possible.
5) When you've got your full stretch, you return back to the starting position by bending your elbow, pivoting the joint, and leaning backwards.
Finally, for those REALLY interested in the extreme end of strain (and dang sure their connective tissue is made of steel), consider looking into using straps and working on super, super heavy chin holds and over-under holds. Avoiding lockout, just hold the bastard for 3-5 seconds, rerack and do it again 5-15 times. If you can deadlift, say, 250lbs, you can probably just hold it another 50-100lbs while standing. Your body is going to feel that.
Finally, for those REALLY interested in the extreme end of strain (and dang sure their connective tissue is made of steel), consider looking into using straps and working on super, super heavy chin holds and over-under holds. Avoiding lockout, just hold the bastard for 3-5 seconds, rerack and do it again 5-15 times. If you can deadlift, say, 250lbs, you can probably just hold it another 50-100lbs while standing. Your body is going to feel that.
For those who want lats like Dorian, imagine slamming on another 50-70% more weight than you'd normally do for your chins, and just hold it without worrying about your grip, and just hold it there for as long as possible. And if you avoid lockout, you hit the biceps pretty hard.
cheers,
Jules