No,it does not lower chest when you work out your abs....
p90x
The ab lounge is a great machine that works your lower abs. It targets the lower area to tone muscle and eliminate fat quickly and easily. There are also specially designed crunches that can target abs.
do lots of leg lifts! this will help build lower abs. also knee ups will help
Lower abs can get toner with exercise. Doing crunches or sit ups on a daily basis can tone the stomach muscles.
There are a lot of lower ab workout around. However, because the lower abs tend to be a location where body fat stubbornly refuses to bulge from, it is possible for someone to have really muscular lower abs but not be able to see them because of the fat sitting on top of them. As far as exercises go, I don't believe there is any specialized equipment you need. Planks, reverse crunches and leg raises all work the lower abs well.
put down the fork
There are many dvds that are good for exercsing your lower abs. Checking out your local target or walmart exercise sections will provide many great dvds.
Your lower abs are an extension of your rectus abdominals or better known as your 'six pack'. When you exercise the bottom half you create a stronger frame for breathing as well as stability to your diaphragm. It gives you a base to work off the rest of your abs with.
legs extended = lower abs bias legs tucked in = upper abs bias so abs in general
situps in a decline position situps towards left and right side leg raises for lower abs
generally exercise and eating right. don't just do crunches, use your lower abs and upper abs as well as your obliques.