One of the most important aspects of sports betting is tracking the movement of the over/under line. When the masses are betting on one team, the over/under line moves upward, indicating that sharp bettors are taking the opposite side. The opposite is also true when the opposing defenses are far superior to their advertised strength. By knowing how the over/under line moves, you can place your bets accordingly. Below are some tips on how to bet on sports with an under/over line.