Sit-ups and crunches both target your core muscles, but work differently. You can use both exercises to build strength, endurance, and control.

If most inner-thigh openers feel too easy (and your ankles and knees are injury-free), try Frog pose. It “opens the hips and ...

Hold both ends of a jump rope and let it hang in front of you. Limit the space between your feet and the ground to between ...