Extreme stretching sucks ass. Even Dante (creator of DC) will say this. However, he also says it’s vital to both recovery in this higher frequency scheme as well as for muscle growth.
Yesterday I did the Bicep, Quad, and Hamstring stretches. I personally do these immediately upon completing the movement for a given muscle. Sometimes though, as in the case of quads yesterday, I have to rest first.
Dante’s descriptions of these stretches can be found in post 103 here:
Extreme Stretches (courtesy of the Inhuman one) - Page 5 - IntenseMuscle.com
And there are pictures throughout that thread as well.
Currently I can only hold the stretches for about 30 seconds. 60 is recommended so I perform the stretch twice for 30 seconds.