In fact, the main reason is that you jump "very hard". You think it takes strength to jump well, which means that your muscle strength is insufficient and your muscles are not too long. You need to buy strength to jump. Stretch your muscles more, and then do explosive muscle strength training, and your physical strength will go up and naturally come alive.

It may be because it is thin, but it is not accurate. Dancers are only a little fat, but their muscles are very explosive. And your thinness is not only less fat, but also your muscle strength and physical strength. So the key is not fat or thin, but muscle.