Contributed By Scott Lipscomb

Any great movie star knows how to embrace a role. Tiffany Haddish is no exception as she is set to hit the ground running in her latest role as Florence Griffith Joyner aka Flo-Jo.

Haddish tells People Magazine that she is undergoing a fitness plan to transform her body, ““This is going to be huge — and my legs are going to be amazing!” the 41-year-old told the magazine. “Florence Griffith Joyner was an amazing human being and the more I’m learning about her, the more I’m like ‘Wow!’”

After already losing 50 pounds Haddish is excited for her role “First of all, it feels good to be able to wear a two-piece and not feel like, ‘Oh, I got to put a whole sarong on and a very large coverup, coverall situation. It feels good to be able to be free. And the main thing about the whole transformation is my knees feel like they’re happy. And when my legs is happy, Tiffany’s happy.”

As far as style points, Haddish has been trying on the iconic nails and track suits Flo-Jo wore. ““Yeah. I have tried on some of the outfits and I must say, I look pretty darn good in them,” she told PEOPLE. “I had the long nails over the summer. We don’t have long nails right now because there’s a lot of typing that I’m doing; I’m in the process of writing my next book. So we need the fingertips so we can move quickly on the keyboard, but the nails will be back sooner than later.”

The untitled Flo-Jo biopic was announced in June and will be produced by Tiffany with Flo-Jo’s widower and former coach Al Joyner as a creative consultant.