Okay, it's been a while since I've been on the bike, but I've decided this is going to my year, in terms of working out. I bought a Specialized Air Tool Comp Floor Pump and have a TREK 7200. Obviously not having ridden in while, the tires are a little low. I've never used a bike pump, so I assumed the handle would go all the way down when I pushed down, but it stops about halfway down. Am I doing something wrong, or is this how it's supposed to work? Any help is greatly appreciated.