Practice standing up from a bridge without the walkover. You've probably lost some flexibility, but don't worry, it's easy to get back.
The closer you can walk your hands to your feet in your bridge (i.e. the more flexible you are), the easier it will be to stand. This is because when your hands are close to your feet, more of your weight is over your hips leaving less weight to pull forward to standing. The further your hands are from your feet, the more weight there is over your chest and arms, making it very difficult to push to your feet (and very likely to collapse on your head).
Anyway, here is a great drill!
Bridge rocks - From a bridge, practice rocking (shifting your weight) back and forth. Think: "chest over hands, hips over feet". When you've got it down, try 3 strong bridge rocks and with the momentum of the 3rd one when your hips are forward over your feet, come to standing.
Remember not to twist your body, but bring your whole body up together (to prevent injury). First your hips, then chest, then shoulders and head.
First off plz change your name on weplay that is inapropriate, well all you have to do is do it like your back walk over, all you have to do is just put your self in to it. well that is all i have to say, Peace!