This machine helps training for push ups. It is very simple to use. You do a push up when the lights shine. You can also change the pace of the light if you think the pace if too easy or difficult to follow.
Link to video: https://youtu.be/LwbRO9UFUkY
Step 1: Copy the Codes
Step 2: Follow the Instructions and Build Your Arduino Thingy
Just look at the photos above and do as it shows