Assume a prone position on the floor, legs together, pelvis neutral. Extend your arms overhead, shoulders elevated (away from your ears), & grip a towel or resistance band with hands about shoulder width apart.
Create tension by attempting to pull the towel apart.
Squeeze your triceps and raise your arms off the floor. Maintain tension as you drive your elbows back, exhale, pulling the towel towards your chest. Lift your chest & retract your shoulders blades. Pause, squeezing your upper back, and then extend your arms back to the start. Repeat for repetitions.
Note: Avoid extending with you lower back.