Add Yahoo as a preferred source to see more of our stories on Google. THE DUMBBELL THRUSTER is an exercise coaches love to add to their workouts, especially when the goal is to ramp up the heart rate.

A form of electric propulsion known as Hall thrusters — a type of ion thruster — may actually pack more bang for the buck than expected. Hall thrusters have conventionally been used to adjust the ...

THE DUMBBELL THRUSTER is an exercise coaches love to add to their workouts, especially when the goal is to ramp up the heart rate. If you've ever been tasked to take on a few rounds of the thruster, ...