Boston-based personal trainer Helena Collins calls the affordable little pedometer “the most effective fitness tool known to man”—or woman. “Becoming aware of how much you move is such motivation to move more,” she says. “Not only for you, but for your whole family. Kids love pedometers—it becomes a family challenge about movement, not exercise.” It also may be fun to track how active (or inactive) you are each day. For starters, 2,000 steps is the equivalent of one mile. To boost your physical and mental health, wear a pedometer and challenge yourself to increase your steps every day.