Its odd to me that attitudes seem to be reverting on this kind of thing. I'm 34, when I was a kid we did cartwheels, handstands and any other jumping etc we wanted and no one cared that knickers were on show. We were kids and it was innocent.
I remember my mum telling me she was caned at school for doing a handstand against the wall because her knickers were shown.
Minus the corporal punishment we seem to be going back to old attitudes. I think its a real shame, I don't want my little girl to be ashamed or worried about showing her body.