The Standing Oblique Mash-Up exercise works your shoulders, back, chest, triceps and abs.
Stand about two to three feet away from a wall, and place your hands on the wall, just below shoulder height. Lower your chest in [unk] push up, keeping your arms close to your sides. At the same time, put your left leg to your left elbow. If you wanna make this easier, stand closer to the wall. Do 12 to 15 reps, alternating legs, in three sets total.