1. Sit down on the chair and place your forearm of your weakest/dominant hand on the table with your hand hanging over the end of the table
2. Have your partner hold the ruler with the bottom end in between your fingers so you can practice holding the ruler with 2 fingers
3. Have your partner hold the ruler and remove your fingers
4. Have your partner hold the ruler in line so that the mark is level with the top of your thumb
5. Your partner will drop the ruler without telling you beforehand, and you will catch the ruler as quickly as you can
6. Note and record the number level with the top of your thumb after you have caught the ruler in a table
7. Repeat the test at least 5 times
8. Swap places with your partner and repeat steps 1-7
