Powerlifting and strength training requires overall core strength. Working the trunk is required.Make sure to incorporate abs and lower back work into your rotation. Yoga is one way to strengthen the core.Use an ab wheel or standing crunches using a cable system. Make sure to do 10 to 15 minutes of abs and core work per week minimum.A strong core will lead to heavier lifts. It will also help to ensure that you do not injure your core.