Stadion's Sports and Martial Arts Training Discussion

If I'm stretching warm once a day already, is the cold stretch additive or synergistic in it's effect? (this is what I meant).

Does stretching cold, when you don't have time to warm up (say, 5 minutes in the morning) yield benefit? Or do all gains in flexibility only come when warm?

Nose-and-toes is a bit difficult for me, but if I hold my arms out I hold the bottom of a deep squat fine. Should I start with kettlebell front squats? Also, I suppose the 90/90 stretch you describe would be isometric, so I suppose I could do it every other day, while the breathing deep squat could ...

I have a very inflexible right hip, from what I believe to be lack of proper rehab after a broken leg when I was 3. In any case, I have extreme difficulty performing this stretch: http://stronglifts.com/the-only-6-static-stretches-you-should-really-do/ (The 90/90 Stretch). My leg pops up to more lik...