In 'Flashback Fridays' News: Actress/Dancer-Choreographer/Producer, Debbie Allen Posted The Picture Below Of Her And Her Sister, Actress Phylicia Rashad, When Allen Guest Starred On The "Cosby Show" As Rashad's Character's Take-No-Prisoner Personal Trainer, She Hired To Whip HerInto Shape For A Fitness-Best-Dressed-Fashion Bet Rashad's Character Made Against Her TV Husband, Bill Cosby. Allen Captioned The Photo, "Sisters.#‎tbt". I ♡ It!