Lie on your stomach with your upper body slightly raised, feet shoulder-width apart, arms pointing diagonally forwards in extension of the body to the respective side (Y position). From this position, pull your shoulder blades together and raise your arms until your elbows are at shoulder height and your arms are parallel to the floor (palms facing inwards). Keep your arms straight and hold the position.
Attention:
Only the arms should be raised, nothing else - aim to isolate the upper back.
Harden:
Holdd additional weight in your hands or on your arms.