All the girls at the gym pretty much have those small bruises at the hips just from doing bars, (i.e. not from messing up or anything), take a look at Mary Lou's bars routine from the '84 Olympics - she pretty much is hitting the low bar on her hips from a handstand swing from the high bar! http://youtube.com/watch?v=SPwokPNMpCE ....the bars are so close, it's a skill, not a mess-up. Check it out!

Here's another view of that skill from the U.S. Championships: http://youtube.com/watch?v=9LaZ6O2aVqk&mode=related&search= This one makes it look more like a swing under the low bar than hitting it, but still, seems like a big boom!.....from a giant swing.

They took out those hip-hititng skills when it was finally agreed that they were detrimental to the health. Here's Nadia's bar routine from '79: http://youtube.com/watch?v=M55LwYOutEM&mode=related&search= , and from Montreal '76 Olympics, compulsory bars: http://youtube.com/watch?v=OvNWOj1CFrE&mode=related&search=