We hadn't thought of that one before! In a new clip of I Am Cait, Caitlyn Jenner realizes that because she's the active gal she is -- she's gonna need a sports bra to strap those lady lumps down!

The Keeping Up With the Kardashians appears to be embracing her new life as a woman, enjoying time with family, old friends and new pals. The teaser clip features Caitlyn playing tennis, toasting with friends and getting style tips in her glam closet from Kim Kardashian.

The Olympian also has a touching sit down with her mother, Esther, who has been very supportive of her transition.

I Am Cait premieres on Sunday, July 26, at 9 p.m. ET on E!

Watch the video here! And check out this uber-glam promo pic that was just released. Hot mama!