When lying down and needing to sit up, I either push myself up with an elbow, or bring my knees to my chest and then kick out, creating the momentum to propel myself up off the couch. I checked a yoga book at the library and saw that sitting up without hooking your toes under something is called a "roll-up". Is this a widely attainable skill?

My motivation for the question is that I have difficulty just sitting up straight on the floor (like a 100%-supported L-sit), so I wondered if I was far below average in this area.

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    The hip joint mobility to actually sit up on the floor with straight legs and a neutral spine is probably much more rare than the core strength otherwise required to perform the movement.
    – Affe
    Jan 5 '15 at 22:58

Yep, it's pretty do-able. I just did one right now to be sure. There's actually a bunch of muscles involved since you're locking your legs straight to help on the lever aspect.

The exercise is referred to as a straight leg situp. Off the top of my head, I think some general full body conditioning stuff would be good, particularly the flutter kick, turkish get up, and off course the back squat.

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    I can do one by swinging my arms overhead like he does in the video, so I'll get there. The flutter kick looks a lot healthier than training the situp directly.
    – Noumenon
    Jan 5 '15 at 12:58

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