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The Benefits of Using a Thrusting Machine Thrusting machines, also known as glute box and hip thrusters, are a great way to work the big muscles in your back. They focus on the gluteus maximus or butt muscle, as well as the hamstrings and core. The Buck is smaller and less expensive than other sex toys with thrusting, which can run upwards of $1,000. It also has a built-in safety feature that cuts power to the motor once you press the red button. What is a Thrusting Mac