How can I stop my leg sliding back and my body collapsing when jumping?

My lower leg slides back really far and then when I land my body falls forward. I HATE my jump position so so much Thanksssss.What the hell is glutes and core? Lol.Thanks everyone. Keep the answers coming, I need help here

Add strength to your inner thigh, glutes and core! Its all about holding yourself in place with your muscles.

Be confident I bet it isn't even that bad Try to hold your body more, It may be your horse that makes your jump position bad or a lack of confidence or Just you First concentrate on your leg because you don't want to hurt your horse when jumping because it might put him/her off.when you have cracked that practice with little jumps and get bigger and bigger and do it without concentrating on your leg and see if you do it naturally Then concentrate on your back. try a ow jump first and see if that improves it then if it doesn't don't lean forwards in take-off and see if you land normally because i don't lean forwards anymore. try that and see if it helps if not send me a message and ask for more advice!

Use half chaps if you don't already; they give you an extra grip with your calves. Also, you need to strengthen your core (abs) and when you're jumping, sink your heels down, and close your leg around the barrel to grip. Balance is key. So the more secure you are, the better your position and balance will be.

Read this . 101 Jumping Exercises for Horse & Rider (Plastic Comb)by Linda Allen

Glutes are your butt muscles. Core is your stomach muscles.I'd just work over the fences in two point. This way your weight sinks into your heels and anchors your leg in place. You should have a solid two point on the flat before you do this though.

you need to go back to basic flat work. you should have even contact through your entire leg (thigh, knee and calf). you should have your heel down as deep as comfortably possible. if you grip too much with your knee, then your leg becomes a pivot, resulting in your problem. also, if you are focusing solely on keeping your heels down, this can take your lower leg off too. so when you jump, you launch forward with your upper body and causes your leg to fly back. it'll be up to you and your trainer to determine the problem. but practice in two-point A LOT. you should have a good grip with your calves while sinking into your heels and making them as deep as possible. when you can hold both your hands 6 inches from your horses neck and still maintain your balance, then you can try it in trot (and later on, canter). another good exercise is vertical far. you basically stand up (tuck your hips under you; imagine you are a trick rider). if your leg is too far back, then you will fall forward. if it is too far forward, then you will fall back. when you can stand up no problem, then it's in the perfect place (this can also be done at the trot and canter; however it will take a while to get there). when posting and cantering, try to keep your leg still and focus on your calf and heels. odds are, your leg shifts around on the flat too. when jumping, PUT YOUR CALF ON and don't let go. tell yourself that everytime you jump. your calf should tighten everytime you even look at a fence.longe line and no stirrup work are also very good for developing a good seat and leg. i would also strongly suggest gymnastic work.

It sounds to me like you collaps your body from your stomach when going into jump postion. Alot of people think that its the top half you need to worry about more than anything like going forward with your top half. But its actually all about your lower leg and how secure & stable it is to support your upper body into staying in the correct postion. You could try like some people were saying jump postion , or 2 point , going around the outside of your arena in walk , trot and when your ready canter , this will not only help with your balance which is important when riding but helps to strenghten your calf & thigh muscles helping you to be able to keep your leg from comming back but will also stop your upper body from collapsing too much. Have you tried holding on to the marting gale for more support or the horses mane?No stirrups will help you with developing a better seat and more of a feel for the horse but also to help absorb the horses movements and will help a great deal with balance. Even practise over canter poles in jump postion!