Go into a Grand(e) plie and push your legs (at the kneew) out with your arms and or elbow and alternate between left, right, and both...it really streches the inner thigh.
this is somewhat a jazz/half split. bend one leg in ( the front leg) and push the other leg out straigt to the back and lean forward then turn to the side which is also known as the corner.
Another is a vertical spit... you push your leg up against the wall while having the other on the floor where you keep your balance and try and ger into a split against the wall.
Trying to reach a scorpion(sp?) is also a good way to strech...just don't pull too much because you dont want to injur yourself. Then you can also strech into a split from there if you want to attempt it.
click that to see scorpion ------->
VIEW SCORPION