If you are worried about them falling off you could put a rail system on it. However, I haven't had a problem with them falling. I usually squat next to them and tuck my knee under the inside of the leg I'm working with because it helps to keep them steady so they don't kick and keeps them in the middle of the stand. I'm planning on doing step by step instructions on how to build a stand. If you are interested I can include how to put a rail on it. It would be something you can take off or move to either side.