Cheerleading Conditioning?

I am in my school's sideline cheer team & a rec. competitive team. I feel I'm really out of shape & just want to shine this year with no limitations. I'm so determined to get my twist downs and to be able to hold all of my one legged stunts. (I'm super flexible, but I sometimes just give up) I realize I NEED to condition, & need some help with how to condition. I mean I know the basics with stretches and push-ups/sit-ups, but I have a laziness issue. I have no problems sticking with it once I start, but I can never start I always get to preoccupied.