Walker - Cap on max distance. Lesser than Runner. For people who are on the move but not a Runner. Meaning they go to work, go to meetings, walk multiple blocks in NYC. Walking their dogs etc. Different attribute than Runner.
Runner - Cap on max distance, but higher than Walker. For people who exercise everyday. Run for fun. Marathon training. Cardio training. Runner has higher attribute than Walker.
Hiring Feature - Players can hire a Walker / Runner. Profits are shared between them. One who is hired is 20/80% split. 80% being the one hired receiving more profit.