Don't use momentum or jerk your body at any point. Slowly reverse this motion without allowing your knees to become un-tucked from your body. In a controlled fashion, roll your torso upwards, bringing your knees toward your chin. Flex your hips and bend your knees, holding them above your hips in front of your torso. Hang from a pull-up bar with an overhand grip and your hands roughly shoulder-width apart. That's mostly a hip flexor exercise, not an ab exercise. They start with their legs hanging straight down then flex at their hips. Whether you're hanging from a pull-up bar, have your elbows in those ab straps, or you're on a machine, the leg raise is a great exercise. You can create the same training effect with a cable and use much lower loads. Now, you could certainly hold very heavy dumbbells, but they may exceed your grip strength. But when doing them with a cable or stretch band, the angle of the cable forces you to work hard to stay upright and maintain that position between reps, giving you more time under tension through the range of motion.
There's not much resistance when you're standing upright holding a dumbbell because the dumbbell is very close to your body, giving you a huge mechanical advantage over the weight. Reverse the action and finish the rep by slightly flexing your torso to the left against the resistance. Without rotating your body, slightly bend your torso sideways to the right until you feel a mild stretch in the left side of your torso. Make sure you're standing far enough away from the cable or band so that it's at roughly a 45-degree angle to the floor. Stand tall with your cable at your right side with your feet about shoulder-width apart. Grab the handle of a cable (or resistance band) that has a low attachment, roughly ankle level with your right hand. But the weight on one side offsets the weight on the other, making this exercise pretty ineffective at loading the lateral flexors of the torso. And many people do it by holding two dumbbells, one on each side. You see it all the time in the gym, but this exercise doesn't make biomechanical sense.
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