Every day and every hour, you have to put on the whole armour of God. You have to guard your heart, your eyes and ears at all times. This means that even when you are at the gym, you must never get sidetracked by what you listen to.
The gym plays worldly music that may lead you into temptation. You can safeguard your ears during a workout and still get an explosive pump by listening to upbeat Christian workout music.