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.

One popular fitness expert shares the best home ab workout and 7 intense lower ab exercises, for a combination that hits your entire core. Lower abs are a common challenge; targeted workouts can be ...