You can do it, I was hoping to institute it down here, if you make it a goal system and announce it up front.
If its in the sylabus of your new member program and a requirement. And you allow the new member to set a physical goal, and then offer them several different programs, pair them with a lifting buddy, and make sure your active chapter is also pretty fitness conscious . . . Good luck.
Let me suggest using the body-for-life challenge as a model.
www.bodyforlife.com I believe. They can win a hundred thousand dollars . . . and they get fit, and its easy.