Stand tall like a puppet being pulled up by a string.
Keep your shoulders relaxed and don't shrug them up.
Start from a 'hands-up' position and bring your elbows down.
Imagine there is an orange between your shoulder blades and you need to squeeze it.
Slowly take your arms up without shrugging your shoulders.
Week 1: No hold x 11 repetitions x 3 sets
Week 2: One second hold x 11 repetitions x 3 sets
Week 3: Two second hold x 11 repetitions x 3 sets
Week 4: Form correction without progressing any further where you solely focus on getting the form right.