The laws of physics

Can someone help me figure this out?

Sometimes, I see a toy, and I really want it. So, I hold myself up on my arms and look at whatever it is I want. I rock back and forth. I concentrate really hard, push, and Boom...I move. But instead of getting closer to the toy, I am further away. I try again. Further still. Why? Why can't I move forward? It's especially frustrating on the wood floors, since I end up sliding faster and further.