Stretch, specifically chest openers
In a doorway stretch your pectoral muscle.

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On a foam roller parallel to your spine roll your shoulder back opening your chest.
Upward dog with deep breaths.
Side stretches while kneeling

     https://www.yogaoutlet.com/userfiles/Guide/image/Yoga/Yoga-Woman-Doing-Gate-Pose-300×299.jpg
Your favourite stretch