Martha Stewart is branching out.

The business guru is one of four stars on the 2023 cover of “Sports Illustrated Swimsuit” edition. She joins Megan Fox, Kim Petras and Brooks Nader.

Stewart explained on the “Today” show Monday why she did it and how she prepared for the shoot.

“I’m sort of shaking because it’s odd to go to an island and get changed into nine different bathing suits in one day in front of all those people,” Stewart said. “I like that picture. … And it turned out OK!”

She explained how she was asked just weeks before the shoot was to take place.

“That was kind of a request that I’ve never had before,” Stewart recalled. “To be on the cover at my age was a challenge. And I think I met the challenge.”

How did she get ready for the shoot? Diet and exercise was the way she went.

“I didn’t starve myself, but I didn’t eat any bread or pasta for a couple of months,” Stewart said. “I went to Pilates every other day and that was great; I’m still going to Pilates every other day ‘cause it’s so great. And I just, I live a clean life anyway — good diet and good exercise and healthy skincare and all of that stuff.”

Mark Heim is a reporter for The Alabama Media Group. Follow him on Twitter @Mark_Heim. He can be heard on “The Opening Kickoff” on WNSP-FM 105.5 FM in Mobile or on the free Sound of Music App from 6 to 9 a.m. daily.