Most boys train headspring at some point in their career.
Is it a good idea for girls?
Swing Big likes the drill:
… two ways of doing front headsprings, one off a mat and the second on the floor. I’m pretty sure I’ve never had my gymnasts do it on the floor. I just haven’t felt it necessary. By the time they have a good one off the mat generally their front handsprings on floor (or TT, or into the pit) are pretty good. …
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That edit is from Enrique Trabanino, who likes headspring as well.
I like it too. Especially for young beginners.