I showed this on the steak video and wanted to post a break down in case you missed it. This hand trick is a really easy way to tell if your meat is ready to your liking.
I pulled this image from www.usefulllifetips.com
This is a great tip because then you don't have to cut into your streak to tell if its done. This is especially important if you have a date and want it to look really professional. Also cutting the steak and then and placing it back on the pan or grill will cause it to cook unevenly.