A personal trainer says this is the best exercise you’re probably not doing to build hip strength

Woman sits on yoga mat doing a single leg lift.

One of the most noticeable effects of spending a lot of time sitting is sore hips.

That’s because sitting for long periods of time shortens the hip flexor muscles—which run down the front of your pelvis and groin and attach the bottom of your body to your torso—and leaves your range of motion reduced.