If you can lift your arms up to 90° like on the left, then the “standard” shoulder active bar is the right one for you.

The same goes for our other shoulder active bar models:

You must be able to lift your arms up to approx 90°, in order to train without pain.

If you can only lift your arms up to 45° like on the left, then the “acute” shoulder active bar is the right one for you.

Whether the “acute” model is the right one or not can be tested as follows:
Imagine someone is standing in front of you with a weapon and says “hands up”. If you can lift your arms up into this position, fingertips pointing to the sky, your upper arms are more or less vertical, then the “standard” shoulder active bar would be the right choice for you. If this is not the case, and the arms can only be raised to about 45°, then you should choose the “acute” shoulder active bar.