•Get lots of speed into it! It may be scary, but split jumps (at least mine) are SO much better when they’re entered at top speed. Extra speed will allow you more time to get your legs into a full split position, as well as extra height.
•Feel the undersides of your legs snap into position. You can’t just jump up there, point your toes, and expect your legs to split (even if you can do the splits perfectly). You have to force your muscles to give both legs equal extension. You should feel a certain level of extension after you get up into the air, and then a higher level of extension when you snapped your legs as far out as they can go. Remember- this snap is a quick movement. You don’t have much time up there to hit your split position.
•Stretch your hips, groin muscles, & leg muscles. Do over splits too. Some people can do the splits, but their split jumps still don’t even make it to a full split. This is why it’s important to try over splits.
•Make sure your hips are turned completely forward in your split jump. When you do the splits on the ground, you’ll see how your hips are. On the ice, it’s important that your hips are nice & straight like that, as well as your upper body.
•Try putting your arms up in a V. It usually helps me get more height.
Best of luck :)