Frequent stretching and persistence is what works. There are no short cuts. The only way for you to get your left splits more quickly is for you to stretch more often. The optimum would be with a four hour break between stretching sessions. Four ten to fifteen minute sessions over the course of the day could come fairly close to that. If you don't want to stretch that often it is completely understandable but the nearer you get to that the faster you'll get the split.
You should start with a warm up to get your heart rate up and your joint loosened up. To target similar movement as for splits you could do jumping between alternating left and right lunges, kicking or swinging your legs backwards and forward, hitch kicks, scissor kicks and split jumps. It doesn't have to be all of those, just a couple of minutes high-intensity activity so that your heart rate in increased. Then do preliminary stretches. The ones I find best for left and right splits are knee down lunges, knee down calf/ham stretch, and pigeon/swan pose. Then do the splits.
In all of the stretches they need to be gradual and controlled. This is both the safest and most effective way to stretch. If you injure your muscles they will grow back thicker to protect themselves which will make you less flexible. Also stretches work by encouraging you muscles to relax and grow accustomed to an increased range of movement. If you quickly force yourself into a stretch the muscles don't have the opportunity to get used to the stretch and relax. They tense up in an attempt to prevent you from exceeding a safe range of movement, just as if you slipped on an icy floor. For this reason you should not bounce, force a stretch to the point of pain or raise your hands until you can sit in full splits without pain. Instead you should lower into the stretch in a gradual controlled way. When you reach the point where you feel a strong stretch but not pain you need to remain at that point until you feel your muscles relax. You can do this with patience and controlled breathing (passive stretching) or by inhaling, tensing against the stretch and holding to tire your muscles faster, then exhaling and relaxing (PNF stretching.) With either method you can push a little further into the stretch once you relax and repeat the process but you do get diminishing returns so it is pointless to continue beyond two or three cycles and can cause injury.
It can help in splits to sit with your torso upright so that your weight helps to push you down and so that you are improving the movement of your hip flexor backwards (typically the sticking point.) To keep it gradual and controlled you need your hands to help support your weight so if you can't reach the floor use a pair of props such as thick books or even chairs either side to put your hands on.
When you get quite close to splits the stretches start to get less effective because more of the length of your leg is on the ground and there is less leverage acting in the stretch. You can deepen the stretch at this point by bending up your back leg in knee down lunges, pigeon/swan pose and splits and grabbing your foot or ankle with your hand on the same side. Use the other hand to help you balance and to keep it gradual and controlled, using a prop if necessary. Don't do this until you are no linger getting a strong stretch from the basic version of the stretch or you could over-stretch and injure yourself. Another option in splits is to raise your front foot on a soft stable surface such as a rolled towel or blanket or a foam yoga block or roller.
Get in your left split and put your arms in the air, it will force you to go all the way down. Hold it for as long as you can before it hurts too bad. Do that everyday and you will have it in no time.
do all of the stretches that you do for your right side, but hold them for a longer amount of the time in order to improve the flexibility on the left side
Stretch alot!! U may find it annoying but do certain stretches for ur left leg i hav tht same problem and im fixing it
