Summer is right around the corner, and if you're looking for a challenge—and a six-pack—Jeff Cavaliere, C.S.C.S., of Athlean-X has you covered with an ab workout that’s built for all fitness levels.

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Despite the catchy lines from scam fitness plans and claims of questionable 'lifestyle' influencers, developing strong, solid-looking ab muscles takes dedicated effort. Thankfully, the old marketing ...