Wear a weightlifting belt for functional fitness only for the heaviest sets or in case of working for high reps with a significant weight. Don’t use it for moderate workouts or exercises that don’t stress your back. Start putting it on for 70% and higher loads when you need maximum back control. You can also use it to cease back pain after some injuries if your doctor allows you to do that.Wear a weightlifting belt for functional fitness only for the heaviest sets or in case of working for high reps with a significant weight. Don’t use it for moderate workouts or exercises that don’t stress your back. Start putting it on for 70% and higher loads when you need maximum back control. You can also use it to cease back pain after some injuries if your doctor allows you to do that.