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Masonsfive I think this is something worth pursuing. I am not a coach, but I volunteered to coach the jumpers on Jr. High a while back, and I saw that a lot of them were just running into the bar backwards. The straddle allows you to LOOK at the bar when you are jumping, so the natural tendency is to want to jump UP rather because you can see where the bar is. I did some drills where I just had the kids do an approach run, plant, kick and jump up, then just land on their plant foot. The point was to reinforce the the idea of jumping UP. I actually put the bar up at maybe 6' 5", so the kids would try to get their heads up over the bar.
The biggest hurdle that I ran into in trying to teach this is getting buy-in from the other coaches and kids. All they know is the flop, and even if they can't flop, they kind of can't handle the idea of doing it a different way. My experience was a failure because our kids only jumped maybe twice a week, lots of them quit trying, and the best athlete learned to flop.
I myself was probably a good example of a person with good jumping ability by poor speed. I had an official best of 5'7" with the straddle, but was one of the slower guys on the team.
There are jumpers over 7" with straddle, and as a matter of fact there were other jumpers over 7' competing with Dick Fosbury when he won the Olympics. I read a while back that there was a guy still jumping that way very competitively in recent history, but obviously he's one of a few now.