In the HST principles, I don't see a decrease in volume as one of the principles. However, during the program, we go from 15's to 10's, decreasing the volume by 30%. Then, when we go from 10s to 5s, we then cut the volume in half, and only increase the weight slightly. The volume is then 33% of the original volume. I would like to know what reasearch supports the decrease in volume that this program calls for.