Jumping will require strength training on your legs. So maybe a variations of doing some dips with some weights and various jumps, i.e. burpees, tuck jumps, ski jumps, etc.
Also, I'd just like to add, make sure your normal smash is spot-on before you even attempt a jump smash. A jump smash is a very energy sapping skill and requires good strength and endurance, therefore if you do decide to learn it, make sure you use it wisely.
Just like learning to walk before you run, you should learn to get the small jumps right first before doing the big jumps.
Good point. Also, you said you're not jumping high enough for the shots - don't try to hit the shuttle at the highest possible point imaginable. If you can't reach it, you won't be able to hit it. Like Visor said, you should start with a regular smash and just add small jumps and gradually raise the contact point instead of aiming too high. Lastly, make sure you're ready for the jump smash, there's no point learning it if other parts of your game like: footwork, mentality and tactics aren't in order beforehand.
IMO timing is the most important aspect. If your timing is spot on you will hit good quality shots. Practice it to develop a feel, and once you have your form down then you can do muscle training
Can you power smash cleanly with little jump? If not, no point going for high jumping smashes until you get the technique right. You'll hurt yourself. If can smash cleanly, practice half court jumping smash. At the same time, get the timing right. Only then you can focus on jumping higher. Depending on your ability, can go for 15 to 20 high jump smashes in a row. It get better if can do 5 sets. Nothing beats hard work. Good luck. My 2 cts
Recover is very important for jump smash. After landing from jump smash, you need to follow up. Dont jump to the height that you cant recover and let opponent get easy point.
Maybe you could post video of your jump smash so the online coaches could judge which stage you're at. .. crawl, walk, run or fly?
Check this out: [video=youtube;MyadwjS9HdI]https://www.youtube.com/watch?v=MyadwjS9HdI[/video] Peter is a class player. retired now and coaches but he was 1997 World Champion. He breaks down the Jump Smash into all the components, well explained and demo'd. Kindest regards, -Ajay- Quote of the Day If at first you don't succeed, failure may be your style.