Both work your abs, but in different ways ...

Say goodbye to sit-ups and crunches, do this instead.

Exercises like dead bugs help lengthen and strengthen the hip flexors in a controlled position, which improves form and can help offset the effects of sitting too much, adds Dickinson. Lie faceup, ...

To increase resistance and intensity in a wall sit, add weights like dumbbells or a medicine ball held close to your chest or resting on top of your thighs. Start with light weights to ensure proper ...