I am not sure of the article of which you are speaking about, but if oyu are looking for some advice on how one might gain flexablitiy with the splits, I have some advice.
You will want someone to help with this as you both will be doing this together, using the other ones weight and force. Sit on the floor, with your legs spread till comfortable. you both should be facing one another. Grabing ahold of one another wrist/forearm area and touching the bottoms of right and left feet. Come in closer to each other as to have a good grip. Once you have your position, pull backwards slightly as to apply pressure to the opposing member. stretch should be held for no less than 45 seconds. This should then be done with the opposing member pulling you forward and him back, again for 45 seconds. once this is complete begin to slowly circle either direction clockwise, or counter-clockwise. This should be done 10-20 times in both directions.
The frontal split again will need someone to asist you. Place yourself flat against a solid wall. Heels and head, with back facing the wall should be applied. standing against wall, raise one leg in front of you slowlyas high as possible, with opposing member assisiting the raise. Stop when comfortable. Opposing member raises further about a half inch to inch past resistance. Hold, counting to 10. Once you get the count to ten, the stretchie pulls downward to put pressure. Opposing member is careful not to let grip break from pressure. Count is again ten. Repete as wanted.