If you plan to give up your stirrups, do so carefully. If you haven't worked without stirrups extensively, then start by giving up your stirrups for just a few minutes at a time so that you can build up your strength. And don't be so proud about the challenge so that you sacrifice safety - if you have a jumping lesson over 4-foot fences, replace your stirrups beforehand if you can't ride securely without them.
Giving up your stirrups, even for just a few minutes during each ride, can do wonders for your leg and overall riding position and security. Will you be joining in the challenge? We will!