It helps to "see" strides if you imagine the rear legs instead of thinking about the front. Seeing strides is pretty hard to learn, one day you'll just go out there and it will click ;)
But I agree with the others. Working with ground poles and adjusting your stride with those will help you before you tackle actual jumps. I actually learned while jumping, on a great schoolie who pretty much got distances himself. My instructor had me count... Like 3,2,1 TAKEOFF to help me judge distances. From there I had to start at 4 strides out, then 5, etc.
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