Here is a great workout you can do in 30 minutes with no special equipment. If you are not familiar with any of the exercises you can easily google them as I have used their most common names.
Before you start this workout do a dynamic warm up – about 5 minutes of moving stretches and maybe a short jog.
Set a timer to 45 seconds work and 15 seconds rest for 30 rounds.
I suggest you do the first 12 exercises then a 400 metre run. Rest then do 2 further blocks.
The exercises are in a pattern – Core, Cardio and then Body Weight. You do not need any equipment.
Here they are: