“Sit-ups once ruled as the way to tighter abs and a slimmer waistline,” Harvard’s experts write. They say that plank positions—isometric exercises in which you assume a position and hold ...

That said, if you hate planks, sit-ups, and crunches, the good news is they aren’t the only way to build muscle in your midsection. If you cannot lie down on your back, you’re short on space ...

“Because you are twisting your torso during the movement, you are really engaging your obliques in a way that sit-ups and planks cannot do,” says Steve. Don’t be surprised if you need to opt ...

"Planks strengthen your spine, rhomboids, lats, trapezius, core, quads, glutes, hamstrings, shoulders, and triceps when done properly," Michaels says. Other exercises like crunches or sit-ups can ...

What is clear, however, is that the plank became the favored core exercise a decade or so ago, eclipsing the crunch and sit-up. The latter two exercises can put strain on your spine and hip ...