As discussed in prior columns, the three core lifts alone can build significant strength. But building the torso and trunk muscles will enhance your overall fitness.A number of lifts can be incorporated into building the core. Sit-ups on the floor or on a decline bench work well.Kettlebell lifts of various kinds with medicine ball circuits will also build a strong core. Try doing some side bends with dumbbells or plates for high reps. Some reverse hypers will also build up the trunk and torso.What you will find is that if …