Ben Shelton just revealed the exercise he still dreads after years of elite training: the Copenhagen plank. In a Sept. 30 Business Insider interview, the 23-year-old called the punishing side-plank variation a fixture he never learns to like.
“No matter how many times you do them, they still suck,” Shelton said. “You’ve got to be used to doing things that you don’t enjoy.”
The confession lands differently after his U.S. Open run. Shelton beat Carlos Alcaraz in a four-hour, 28-minute quarterfinal that ended at 3:33 a.m., the latest finish in tournament history, according to the USTA. He sealed it with a 146-mph ace.
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Why Shelton Keeps Doing the Exercise He Hates

A Copenhagen plank resembles a side plank with a nastier leverage problem. Place the top leg on a bench while holding your body off the floor, forcing the adductors, hips, and trunk to stabilize together.
For Shelton, that matters because tennis rarely provides a perfect position.
“Tennis is such a dynamic sport,” he told Business Insider. “You’re in a lot of awkward positions.”
His gym work reflects that demand: Bulgarian split squats, plyometrics, and box jumps are also in the mix. The interview accompanied Shelton’s partnership with supplement company Thorne and included discussion of his creatine and protein use.
After beating Alcaraz, Shelton described what carried him through the marathon: “Whether it’s my coaches, my team over there, my friends and family over here, or the city of New York tonight that showed up until 3 a.m. with ‘USA’ chants until the very end, that was what kept me going.”
Alcaraz’s assessment was simpler: “He is a beast. Shelton is an unbelievable player, powerful. He just managed to play really, really well in every situation.”
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You Don’t Need to Train Like Shelton
The full Copenhagen plank is advanced. Start with your top knee—not your ankle—supported on a bench, shortening the lever. Easier still: keep the lower foot on the floor for assistance.
As strength improves, move the support farther down the top leg while keeping your hips elevated and torso controlled. Stop if you feel sharp groin or hip pain.
“Some of the best things for you,” Shelton said, “are the things that you don’t necessarily want to do.”
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Author: Joseph Arangio








