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Nick Jonas
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Here's what you need to know about the singer's upper body workout.Pop star and actor Nick Jonas has always kept in great shape—you don't find yourself fronting a Mark Wahlberg-inspired Calvin Klein underwear campaign by accident, after all—but it definitely looks like he's been stepping up his training routine lately.In a video posted to Instagram yesterday, the singer gave fans a demo of his "killer" upper body and core circuit workout, which nicely showed off how he's been working on his ab strength and building bigger biceps.
As said here by https://www.menshealth.com/fitness/a34405918/nick-jonas-workout-abs-biceps-instagram/