To ride over an object on the road, you should:

Rising slightly off the seat when riding over an object on the road helps absorb the impact and maintain better control of the motorcycle. This technique allows the bike to move upward with the obstacle while reducing the jarring effect on the rider. By lifting your body slightly, you shift your center of gravity and give the bike more room to navigate the bump, which promotes stability and minimizes the risk of losing control.

In contrast, bumping up and down on the seat could disrupt your balance and control, making it more challenging to manage the motorcycle's responses over an uneven surface. Leaning back sharply may throw off your weight distribution and affect your ability to steer effectively. Bracing yourself tightly could lead to a rigid posture, making it harder to absorb shocks naturally, which may lead to discomfort or loss of handling. Thus, rising slightly off the seat is the most effective and safest approach when encountering an object on the road.