In order to collect data for our supervised learning task, it was necessary to have a large number of users carry an Android-based smart phone while performing certain everyday activities. Before collecting this data, we obtained approval from the Fordham Uni- versity IRB (Institutional Review Board) since the study involved “experimenting” on human subjects and there was some risk of harm (e.g., the subject could trip while jogging or climbing stairs). We then enlisted the help of twenty-nine volunteer sub- jects to carry a smart phone while performing a specific set of activities. These subjects carried the Android phone in their front pants leg pocket and were asked to walk, jog, ascend stairs, de- scend stairs, sit, and stand for specific periods of time