The term 'It's Pumped at the Gym' can be solved by the four letter word 'IRON'. IRON is an essential mineral that is found in many foods and is also a key component of hemoglobin, which carries oxygen in the blood. It is important for muscle health and energy production, and is often taken as a supplement by those who exercise regularly. At the gym, it is common to see people lifting weights with IRON bars or dumbbells.