For treadmils which may be quite substantial affect, Alex has intended a "decoupled flooring" that's an independant flooring area just for a treadmill so it will take the pressure instead of the whole studio building. To put it simply, You should use a wooden drop in whichever way matches you! https://martinulcsi.onzeblog.com/26201748/the-definitive-guide-to-garden-sheds-hatfield