Originally Posted by HardwoodLegend
I've never been able to do full sit-ups without having something to weigh my feet down to the ground, yet I see others doing them without the support all the time.
Why is it that I can't? Is it because my upper body is disproportionately heavy which causes the legs to rise? Or am I missing some type of muscle strength somewhere?
You probably need to engage your legs more. However, I would look up alternatives to crunches.
Here's a video of me that might help