Exercises to help me be able to post without stirrups?

[gr8fulrider]

You can do planks and side oblique crunches at home in between rides.

http://www.youtube.com/watch?v=pSHjTRCQxIw

http://www.youtube.com/watch?v=CMJA332bfs0

I started doing these about a month ago when I realized my core was very weak and they have helped me a lot.