The centre of the ball should be at about shoulder height.
And bear in mind that you don't need to drop from shoulder height.
The man I had come to see tapped the stone wall at shoulder height.
He came out from behind the desk, his hands held at shoulder height.
Stand with your arms crossed in front of you at shoulder height.
He spread his arms at shoulder height and waved both hands.
Even at shoulder height and above, the wall must be too thick to reach through.
With both hands out at shoulder height, she pulled power.
Stand with feet together, arms straight out to the side at shoulder height.
He held it at shoulder height and waited to be discovered.