A bumper or weight plate serves several functions when it comes to weightlifting and bodybuilding. You can use it by itself to perform a variety of exercises including sit-ups, bent-over-rows, squats, lunges and over head lifts. Incorporating a barbell allows you to perform traditional exercises such as deadlifts, lifts and bench press. Overall weight plates are great to start your fitness journey but you'll want to invest in a quality one.