Last April, the "Colombiana" star, 37, revealed that she had enlisted the help of trainer Ramona Braganza to get back in shape for the latest "Star Trek" movie.
To do that, Braganza had to make exercise fun for Saldana.
"Zoe is not a big fan of the treadmill, so for cardio, I focused on dance-based moves and boxing moves to get her heart rate up, kicks, leg lifts, plyometric combinations, and had her doing interval training if we did get on the cardio equipment," the trainer said.
Braganza used Pilates-based exercises to strengthen Saldana's core. "Building back her stamina was key," she said.
And she used strength training to focus on her back and shoulders "to improve posture and give length to the torso," she said. Saldana also worked her legs with plenty of lunges, squats, and deadlifts.
As for her diet, Saldana got some help from husband Marco Perego.
"Her husband Marco and her both decided to get in shape together and their eating plan included a lot of organic veggies and many dishes that had a Latin flare -- but healthier versions," Braganza explained.
By December, Saldana had shed the 70 pounds she gained while pregnant and was able to slip back into her old "Guardians of the Galaxy" jumpsuit.
"Holy S---! You guys, I had to share this, this is one of the old #guardiansofthegalaxy costumes that I wore back in 2013," she wrote in an Instagram post. "After twins I can't believe I was able to slip into this."
She concluded, "It pays off to work hard! I mean it mommies of the world, if I did it you can too."