Are these worth getting

Are these worth getting

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"no"

you can get abs without it. but its still very effective.

sage

i do these

It gave me a shoulder impingement.

I've heard they are pretty good. But you're only gonna get something out if them once you've developed your core enough.

how am i supposed to keep my lower back straight? its impossible for me. I do 3 sets of 8

Means your core isn't strong enough. Proper ab roll outs are difficult to do.

Definitely but the guy in the image is doing it like a grill. You have to do them on your feet and put your face closer to the floor.

Keep your lower back not arched OR straight. keep it curved upwards