The exercise product promoted by actress Suzanne Somers in the 1990s was the Thighmaster. The Ab Roller, Total Gym, and Bowflex were not endorsed by Suzanne Somers during that time period. The Thighmaster gained significant popularity through Somers’ endorsements, focusing on thigh muscle toning, while the other options had different endorsers and marketing campaigns, making the Thighmaster the correct choice as the exercise product associated with Suzanne Somers in the 1990s.