Book's challenge: Can you do squats like Justice Ginsburg?

WASHINGTON -- Personal trainer Bryant Johnson hears it all the time: Four more years.

That's how long fans of his client, 84-year-old Supreme Court Justice Ruth Bader Ginsburg, tell him he has to keep her healthy so a one-term President Donald Trump doesn't get to name the liberal justice's replacement on the Supreme Court.

Johnson's response: Why just four years? Why not 14?

Interest in the workout of the Supreme Court's oldest justice and in the man behind it has only grown since the election of Trump, who said he'll occupy the White House for eight years. And it's resulted in a new workout book by Johnson, out today: "The RBG Workout: How She Stays Strong ... and You Can Too!"

Ginsburg began working out with Johnson in 1999 after being treated for colorectal cancer. As Ginsburg tells the story, her husband told her she looked "like a survivor of a concentration camp" and needed to rebuild her strength.

That's when another judge referred her to Johnson, a records manager at a federal court in Washington who is an Army reservist and trainer. Their twice-a-week workouts helped Ginsburg regain her strength after her first bout with cancer and again after she was treated for pancreatic cancer in 2009.

"Early on, she saw the benefits of exercise," said Johnson, who also has trained two other justices, Justice Elena Kagan and Justice Stephen Breyer.

The idea for a book came about this year after Politico magazine wrote a piece on the workout. Johnson, 53, took reporter Ben Schreckinger through Ginsburg's workout. The result was a piece titled, "I did Ruth Bader Ginsburg's Workout. It Nearly Broke Me."

A Houghton Mifflin Harcourt editor wrote Johnson after it ran. Would he help with a book? He ran the idea by Ginsburg and she agreed, even writing the book's foreword. Schreckinger helped Johnson write the text.

The result is an approximately 120-page volume that walks readers through Ginsburg's hour-long workout with illustrations of the justice doing each exercise. Some illustrations show her in one regular workout sweatshirt, which reads "SUPER DIVA!" on the front.

Ginsburg is often asked at appearances about the fact she does the plank and push-ups, and not the modified ones where people put their knees on the ground. But the book makes clear she does a lot more, including chest and shoulder presses, bicep and leg curls, one-legged squats, knee raises and an exercise where she throws Johnson a weighted ball.

Ginsburg typically meets Johnson in the evenings at a gym at the court. The "PBS NewsHour" plays in the background while she works out. Occasionally, Johnson says, a clerk has come down with some important brief, and he'll move things around so Ginsburg can read, either while warming up on the elliptical or doing another exercise where he can hold the paper for her.

Johnson can tell when Ginsburg is tired or going strong. Sometimes he'll employ some "funny counting," to get her to do more repetitions of an exercise. Or, he'll cut her a break if she's fading. The justice, he says, never says "can't." He calls her TAN: Tough As Nails.

Three years ago, during a workout session, Johnson noticed something with Ginsburg was off, and she said she felt nauseous. Johnson got Ginsburg's assistants involved and they convinced her to go by ambulance to a hospital where she ultimately had a stent implanted to clear a blocked artery to her heart. As she was about to be driven away, Johnson said he joked: "Justice, don't think you're going to get out of these push-ups."

What was going on in his head was something else.

"I'm thinking, not on my watch," he said.