Yes, you could get that weightlifting workout in while you’re on set, but 4 out of 5 producers (and lawyers) agree that such a decision would make them question your sanity. 
 
The Easyrig Cinema 3 500N is a body-worn support system for camera operators working with camera rigs weighing 24 to 28.5 lb. The system works by using a suspension line to support the weight of the gimbal rig, taking the load off your shoulder, neck, and arm muscles, and distributing it across your torso. This lets you shoot for longer periods of time without worrying about arm fatigue. The system consists of the Cinema 3 Vest, 500N shock absorber, and a 5" extended support arm.