Where is it proven that an extra five pounds can hinder jumping ability? I think a lot of the push for extreme thinnness is aesthetics.
Gaining weight, even just a few pounds, can definitely throw off jumping ability - commentators mention it often.
However, I don't think it's clear whether actually
being five pounds heavier hinders jumping ability in a skater who is already fit and lean. For example, if a post-puberty female skater comfortably weighed 110 pounds, trained at that weight, and could maintain it easily, would her jumps improve if she lost five pounds?
I have heard a few female skaters say that losing weight helped their skating, but I have to question whether this is actually true. It could just be a perception based on the boost to self-esteem that the skaters get, and the compliments they probably get as well (perhaps unfortunately, as the compliments might reflect the 'thin is always better viewpoint'.
I have to wonder whether the weight that some ladies consider to be their fighting weight might be lower than necessary.
Also, wouldn't losing five pounds affect jumping ability, just like gaining five pounds?
And while weight is more important in pairs, because of the throws and lifts, I sometimes wonder if pair ladies' ideal weight might be too low as well. Pair ladies do tend to be very short, and generally vary from very thin to more typical skater thin. There should be an emphasis in pairs not only on the lady's weight, but also on the man's muscle and strength, which he needs for lifting and throwing. I don't know whether the emphasis in equal.
When you think of Hao Zhang and Dan Zhang, Hao is built like a linebacker, and Dan was/is stick thin. Given how strong he was, he should still have been able to throw and lift her if she had been five pounds more.
Two of the best ladies jumpers of all time--Midori Ito and Tonya Harding--weren't very "light and lean." A lot of jumping ability has to do with strength. That is why men are better jumpers than women, even though they are taller and heavier.
To be fair, there are some excellent female jumpers and some very poor male jumpers. The fact that at least some women have landed the 3A shows they are capable of it. I have to wonder whether more women would attempt it, if it was acceptable for them to be a few pounds heavier, a bit more muscled, and stronger.
It's easier to rotate jumps if you are built like a beanpole because alignment is easier. That doesn't then follow that heavier people have a harder time getting full rotation on jumps, because more muscular and trained athletes who are heavier will often be more powerful than a tiny beanpole. The larger skater fit skater with excellent technique will often not need to rotate as quickly because they'll be getting greater airtime and height.
A point that is not commonly considered by female skaters and their coach/team, unfortunately.