Military Press (AKA Overhead Press)
Stand with feet shoulder-width apart, holding a barbell or dumbbells at shoulder level with palms facing forward. Press the weight overhead until your arms are almost fully extended, then slowly lower it back to shoulder level and repeat.
Picture source: https://www.muscleandstrength.com/
One-Arm Cable Tricep Extension
Stand facing a high pulley, hold the handle with one hand, and keep your elbow close to your side. Extend your forearm downward, pause, then slowly return, keeping your wrist neutral and elbow from flaring. Repeat for reps, then switch arms.
Picture source: https://www.muscleandstrength.com/
One Arm Dumbbell Row
Stand with feet hip-width apart, hinge at the hips keeping your back flat, and hold a dumbbell in one hand. Row the dumbbell toward your torso by bending your elbow, pause, then lower it slowly. Repeat, then switch sides.
Picture source: https://www.muscleandstrength.com/
One-Arm Seated Overhead Tricep Extension
Sit upright, hold the cable handle in one hand with your arm extended overhead, keeping your elbow close to your head. Lower the handle behind your head by bending the elbow, pause, then extend your arm back up. Repeat for reps, then switch arms.
Picture source: https://www.muscleandstrength.com/
Seated Cable Row
Sit at a cable row machine with feet on the platform and knees slightly bent, holding the handle with both hands. Keep your back straight and core engaged, pull the handle toward your torso by driving your elbows back, pause, then slowly return to the starting position.
Picture source: https://www.muscleandstrength.com/