Novak Djokovic (Getty Images) Novak Djokovic shrugged off concerns of Rafael Nadal and Roger Federer and announced the formation of a new men's pro tennis players' association that promises to put him on a collision course with his two elite rivals.Nadal and Federer called for "unity, not separation" after reports their longtime rival was spearheading…
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JUSTIN STEELE 4 min read THE WAY MOST guys go about core training will set themselves up for disappointment. They crank through countless situps—but that only trains one function of the core, trunk flexion, and it's easy to get sloppy with form as the reps pile up. You'll need other exercises to build strong, functional
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