A common injury we see in physiotherapy from the repetitive use of the thumb tendons is called DeQueirvain's.
Many tasks require fine movements of the thumb and fingers to grasp and manipulate various small objects. This done repetitively can lead to tight thumb tendons which need to be stretched and tasks varied as much as possible.
If your tasks involve repetitive movements of your thumb or you feel any discomfort around the top of your thumb then this stretch is definitely for you!
Make a clenched fist with your thumb tucked under.
Lower your hand towards the floor keeping your forearm still.
Hold 10-20 seconds. Swap arms. Repeat 2-3 times each hand.
Make time in your work day to stretch regularly (about every 2 hours) and you will go home happy and healthy!