Is it beter to keep your body closer into your knees or give a lot of space between your knees i.e. keep the angle of your knees bigger or smaller?

all i've been told is that your abs need a variety of different exercises. Switch the exercises often. I don't know if that helps...

giving yoru body mroe space is more harder and works the abs more, the whole point of situps is to roll up your abs, not to bend at the waist..with more space you get more movement wich makes you do more work