A benefits adviser who was supporting me a while back gave me some really good pointers to consider when answering these forms:
Can you do X safely and repeatedly?
Can you do X on bad days?
If the answer to either of those is no, the answer to the question is a no.
I know it's hard not to because I do it myself, but try not to feel the guilt they try to force on us. We are NOT the ones who are a drain on society, those who frame us as such are. We deserve to exist, and if to do that we need to claim benefits, then that's that, and it's nothing to feel guilty or ashamed of.