To learn whether or not your upper-body strength level is where it should be—or needs a bit of a boost—we spoke with experts.

Build core strength after 50 with 5 bodyweight moves that train bracing and control, often faster than planks.

98, 99, 100…you mutter through pursed lips, before collapsing flat on your back on the gym floor. Your core crunched to oblivion, your hip flexors probably firing on all cylinders and your neck a ...