Quick workout when you are in a time crunch

I saw this workout online and I tried it tonight.

10 minute fix

I actually did 12 minutes, 5 minutes of core, and 3 minutes of stretching. Instead of chest press, I did 15 push-ups. I only had an 8 lb weight at the time and it worked ok. I would rather have used 15 or 20. I got through 4 rounds. I was not rushing. I did not take any breaks. I controlled the weight and didn't throw it.

Try it and let me know what you think. Perfect for a quick lunch workout or when you are in a rush at home. I did it because I ate a big sandwich today. :/