Thea wanted a bike, so, being awesome parents, we got her one. Then, she didn't want a bike. She just scooted around on it every once in awhile, using her feet on the ground to push her forward. We kept trying to show her how to use the pedals properly, and she kept not caring. Then one day, we were outside playing, and she asked me to push her. I helped her get her feet on the pedals, and she just rode off. I had to show her how to use the handlebars to steer, but that only took 30 minutes or so, the pedals were no issue. Proving just like she did with learning colors, that she's a stubborn bastard, that knows how to do all sorts of stuff, but isn't going to do it until she wants to.