lift weights = podnosić ciężary, dźwigać ciężary

12 Reasons You Should Lift Weights | ACTIVE

Source: http://www.active.com/fitness/articles/12-reasons-you-should-lift-weights

podnosić ciężary, dźwigać ciężary

English sentence and Polish translation

I lift weights from time to time. = Od czasu do czasu podnoszę ciężary.