Side plank exercise is one of the best and effective workouts that build upper body and core abdominal muscles strength and trim your waistline. Side planks also targets triceps and biceps, particular upper arm muscles. Side planks work on shoulder muscles and develop their strength and flexibility. Side planks are simple moves with great effects and benefits. The work on you obliques, hamstrings, quadriceps, core and back muscle and strength of these muscles support your spine and save you from back pain and injury risks. If you have any back pain history then you must ask your doctor before starting any particular exercise routine.