How useful are these things?
>>39317916
Very
>>39317916
Not very
Somewhat
Great for at home ab training. Really works them hard.
Be careful to use decent form though, if you let your back cave, it could hurt after a while
>>39317945
Don't listen to this guy
>>39317916
They are great, especially for lower abdominals, just remember to keep your core tight while doing it and don't push too far too quickly, try and stick to the 8-10 rep range on your knees at first, work your way up to a full layout, then maybe try a few standing up.
>>39317916
can be
>>39317916
Between very useful and not very useful.
As useful as qtddtot