Pumping irons is a term used to refer to weightlifting or working out with weights. Some synonyms for this phrase could include weight training, resistance training, strength training, or bodybuilding. These terms all focus on the aspect of building and strengthening muscles through exercises that require a force to be overcome. Other related phrases could include lifting weights, hitting the gym, or sweating it out with the iron. These terms all describe the physical act of exerting effort to improve strength and fitness levels. Regardless of the term used, the practice of pumping irons remains a popular way to build muscle and improve overall health.