damn, i thought this thread was dead and gone, hey Ryu you don't need to be able to stand up from a bridge to do a kip up...i can't even stand up from a bridge and i can do regualr kip ups, no rolling kip ups, and i'm working on a head freeze to kip up. Standing up from a bridge just helps out alot, that's all. All you have to do is keep practicing, start off by breaking it down:
1) Lay down flat on your back
2) Roll your legs until your knees are right in front of your face
3) Stop there and think about your hand placement, try to keep it shoulder length apart and right behind your head
4) Kick out at a 45 degree angle, there are a lot of ways the people suggest this, for my house i can just aim my feet at the cornor where the side wall and the celing meets. When you kick push off with your hands, flex your abs.
5) Try to land on you feet
These all apply to doing a regular kip up...except for number 3 because when you do it you aren't going to stop, you're gonna use your momentum of rolling back to help you launch foreward. Just remember when you roll back, roll straight back and stop on your shoulder blades, also as always keep your chin tucked in. Don't think about it too much or else you'll psych yourself out.