Recently whenever I've been doing sit ups, I've kind of gotten a bunch of negative pressure on my lower back. It's not really painfull, but its uncomfotable and my body doesn't like it, put it that way. It kind of feels like if you sat wrong in a bad chair for too long, just all at once.
Anyhow, for my form, I have my legs around 90 degrees, and I just have a pillow under my tailbone, since the floor I'm on is pretty hard. Any idea what I might be doing wrong/what's happening?
Anyhow, for my form, I have my legs around 90 degrees, and I just have a pillow under my tailbone, since the floor I'm on is pretty hard. Any idea what I might be doing wrong/what's happening?