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.

As we get older, some exercises start taking more out of our bodies than they give back. That doesn’t mean your training has to slow down. It just means picking smarter exercises that protect your ...