Learn proper weighted cable crunches using an ab mat for full range of motion. Keep your torso back and use modest weight to actually engage your abs, not just lean forward. A dumbbell works as an alternative if you don't have a cable machine.
Chapters
This is a weighted crunch. My recommended way to do this is with an ab mat. Worst case scenario is you could use a mat rolled up. It's not ideal, but it will give you a little bit more range of motion. Now, I do prefer to do this with a cable. So as you can see here, I've already got it set up, arms nice and wide, and I'm coming up all the way as I do it. And you can see that ab mat allows me more range of motion. So I want to keep this back My body as much as I can. If I bring it too far forward, it becomes easy. I want to keep it back because that's what controls the abs. You're not going to need a lot of weight if you keep that in position. Another way you could do it, if you don't want to set up with a cable, is simple dumbbell, and you come up all the way. You get that nice range of motion as you do it. So this is your weighted cable crunch. Give it a go next ab workout.