I've been down this slide several times in the past, however on my last trip, about half way down, I sat up a little to adjust and stopped flat in my tracks. I couldn't get moving again no matter how hard I tried. I knew my husband was coming down next behind me and I was starting to panic (he isn't small) that we would have a terrible collision. Luckily, he saw me stopped when he came around the bend and was able to move to the side to avoid me and kept going down. Somehow, I was able to get moving soon after that. I'm not a big person, so I don't think size was the issue. Stay flat on the slide!