After doing the hamstring stretch, Start stretching your legs. there are different exercise of stretching legs which will help in increasing the flexibility. The more you focus on stretching exercises, the more you will be able to move your muscles which will help in doing splits. One of the simplest exercise of leg stretch is . Stand strait, fold your leg backside and hold it with help of hand. If you have folded your right leg , then hold your foot with right hand and similarly do with other leg. hold in the position for 30 sec. repeat same by changing the leg.